1 2 3 4 5 6 7 8 9 10 11 12 13 A B B C D D C A B C ABD AB ACD 查看更多

 

题目列表(包括答案和解析)

某实验小组在进行“观察水的沸腾”的实验.

时间(min) 4 5 6 7 8 9 10 11 12 13
温度(℃) 90 91 93 97 98 98 98 98 98 98
(1)图中所示的温度是
78
78
℃.
(2)观察到水沸腾前和沸腾时水中气泡的上升情况不同,如图a、b所示.则图中
b
b
是水在沸腾前的情况,图中
a
a
是水在沸腾时的情况.
(3)小组记录的实验数据如表所示:从记录的数据可得出的实验结论是:此时水沸腾的温度是
98
98
℃.实验得到的结论与水在标准大气压下的沸点100℃有明显的差异,其原因可能是此时液面上的气压
小于
小于
一个标准大气压(选填“大于”、“小于”或“等于”).

查看答案和解析>>

The world always makes way for the dreamer.
When I was twelve years old, my father took me to see Zig Zigler. I remember sitting in that dark hall listening to Mr. Zigler  1  everyone’s spirits up to the ceiling, I  2  there feeling like I could do anything. When we got to the car, I turned to my father and said, “Dad, I want to          3   people feel like that.” My father asked me  4  I meant. “I want to be a motivational (激励人的)speaker just like Mr. Zigler,”  I replieD.A  5  was born.
Recently, I began seeking my dream of motivating others.  6  a four-year relationship with Fortune 100 Company  7  as a sales-trainer and ending as a regional sales manager, I left the company at the height of my  8 . Many people were  9  that I would leave after earning a six-figure income. And they asked  10  I would risk everything for a dream.
I made my  11  to start my own company and leave my secure(无忧虑的)position after
 12  a regional sales meeting. The vice-president of our company delivered a  13  that changed my life. He asked us, “If a god would offer you three wishes, what would they be?” After giving us a  14  to write down the three wishes, he then asked us, “Why do you need a  15 ?” I would never forget the power I felt at that moment. I realized that  16  I had accomplished in the past had prepared me for this moment. I was ready and didn’t need a god’s help to become a motivational speaker. A motivational speaker was  17 .
Having made that decision, I was immediately  18 . One week after I gave notice, my husband was laid off from his job, and now we had no  19 . But I held fast to my dream. The wonder really began to happen. In a short time my husband found a better joB.And I was able to book several   20  engagements with new customers. I discovered the incredible power of dreams.
1.A.rise                      B.blow                  C.put                      D.raise
2.A.left                       B.came                  C.arrived                 D.slipped
3.A.get                       B.hope                  C.make                   D.cheer
4.A.that                      B.what                  C.which                  D.if
5.A.dream                   B.idea                   C.girl                      D.speaker
6.A.After                    B.Before               C.Because                D.While
7.A.beginning             B.working             C.acting                  D.regarding
8.A.life                       B.love                   C.income                 D.career
9.A.disappointed          B.moved               C.surprised              D.delighted
10.A.when                  B.why                   C.if                         D.how
11.A.plan                    B.promise              C.decision               D.mind
12.A.attending             B.joining               C.entering               D.holding
13.A.newspaper           B.book                  C.report                  D.speech
14.A.day                     B.second               C.week                    D.moment
15.A.help                    B.job                    C.god                      D.company
16.A.everything           B.anything             C.nothing                D.something
17.A.alive                   B.dead                  C.missing                D.born
18.A.examined            B.searched             C.checked                D.tested
19.A.help                    B.harm                  C.income                 D.money
20.A.selling                B.speaking             C.writing                 D.listening

查看答案和解析>>

The world always makes way for the dreamer.
When I was twelve years old, my father took me to see Zig Zigler. I remember sitting in that dark hall listening to Mr. Zigler  1  everyone’s spirits up to the ceiling, I  2  there feeling like I could do anything. When we got to the car, I turned to my father and said, “Dad, I want to          3   people feel like that.” My father asked me  4  I meant. “I want to be a motivational (激励人的)speaker just like Mr. Zigler,”  I replieD.A  5  was born.
Recently, I began seeking my dream of motivating others.  6  a four-year relationship with Fortune 100 Company  7  as a sales-trainer and ending as a regional sales manager, I left the company at the height of my  8 . Many people were  9  that I would leave after earning a six-figure income. And they asked  10  I would risk everything for a dream.
I made my  11  to start my own company and leave my secure(无忧虑的)position after
 12  a regional sales meeting. The vice-president of our company delivered a  13  that changed my life. He asked us, “If a god would offer you three wishes, what would they be?” After giving us a  14  to write down the three wishes, he then asked us, “Why do you need a  15 ?” I would never forget the power I felt at that moment. I realized that  16  I had accomplished in the past had prepared me for this moment. I was ready and didn’t need a god’s help to become a motivational speaker. A motivational speaker was  17 .
Having made that decision, I was immediately  18 . One week after I gave notice, my husband was laid off from his job, and now we had no  19 . But I held fast to my dream. The wonder really began to happen. In a short time my husband found a better joB.And I was able to book several   20  engagements with new customers. I discovered the incredible power of dreams.
1.A.rise                      B.blow                  C.put                      D.raise
2.A.left                       B.came                  C.arrived                 D.slipped
3.A.get                       B.hope                  C.make                   D.cheer
4.A.that                      B.what                  C.which                  D.if
5.A.dream                   B.idea                   C.girl                      D.speaker
6.A.After                    B.Before               C.Because                D.While
7.A.beginning             B.working             C.acting                  D.regarding
8.A.life                       B.love                   C.income                 D.career
9.A.disappointed          B.moved               C.surprised              D.delighted
10.A.when                  B.why                   C.if                         D.how
11.A.plan                    B.promise              C.decision               D.mind
12.A.attending             B.joining               C.entering               D.holding
13.A.newspaper           B.book                  C.report                  D.speech
14.A.day                     B.second               C.week                    D.moment
15.A.help                    B.job                    C.god                      D.company
16.A.everything           B.anything             C.nothing                D.something
17.A.alive                   B.dead                  C.missing                D.born
18.A.examined            B.searched             C.checked                D.tested
19.A.help                    B.harm                  C.income                 D.money
20.A.selling                B.speaking             C.writing                 D.listening

查看答案和解析>>

如图所示,小李和小华分别用甲、乙凸透镜正对着前方的一支点燃的蜡烛,当凸透镜在A、B、C三个位置时,他们透过凸透镜观察到的烛焰的像如表一所示。


根据看到的现象他们猜想:凸透镜所成像的性质可能与物距和  (9)  有关。
为了进一步验证他们的猜想,小李和小华分别选用不同的凸透镜,并按下图所示安装调整好器材后进行了多次实验,每次都在光屏上得到发光体清晰的像,测量并记下相应的物理量,记录数据如表二和表三所示。


分析比较实验序号2或3或4或7或8中物距与焦距的大小关系及相关条件,可得出的初步结论是:   (10)   ,物体经凸透镜能成缩小的实像。
② 分析比较实验序号1、2、3与4(或5、6、7与8)中第二、三、五列数据的变化关系及相关条件,可得出的初步结论是:同一物体经同一凸透镜成实像时,  (11)   
③ 分析比较实验序号1与5,(或2与6,或3与7,或4与8)中数据及相关条件,可得出的初步结论是:              (12)                   
④ 根据上述实验结果可以判断:表一中甲凸透镜的焦距 (13) 乙凸透镜的焦距。(选填“大于”、“等于”或“小于”)

查看答案和解析>>


同步练习册答案