0  347359  347367  347373  347377  347383  347385  347389  347395  347397  347403  347409  347413  347415  347419  347425  347427  347433  347437  347439  347443  347445  347449  347451  347453  347454  347455  347457  347458  347459  347461  347463  347467  347469  347473  347475  347479  347485  347487  347493  347497  347499  347503  347509  347515  347517  347523  347527  347529  347535  347539  347545  347553  447090 

32.--Do you know how to pronounce this word?

  --Yes. I _  _ in the dictionary yesterday.

   A. looked it up   B. worked it out   C. gave it away   D. picked it up

试题详情

31.--Why are you unhappy, Ben?

  --I was late for class again. I’m afraid Miss Li will be     me.

   A. friendly to   B. angry with    C. busy with    D. proud of

试题详情

30.--What do you think of the sweater?

  --lt’s too   , and I don’t have enough money to buy it.

   A. nice       B. lovely       C. popular     D. expensive

试题详情

29.--How will she deal with the work?

  --She doesn’t want to do it by herself.  She wants to ask someone else to do it,    

   A. yet        B. instead       C. too        D. either

试题详情

28.--We’re all here     Lily. Where’s she?

  --She’s gone to the library.

   A. beside     B. besides      C. except      D. of

试题详情

27.--William,please remember to _    _ the photo taken in Canada here when you come to school tomorrow. I’d like to have a look.

  --OK.I’ll introduce something about it to you myself.

   A. take       B. pass       C. bring       D. carry

试题详情

   从各小题A、B、C、D四个选项中,选出一个可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

26. --What’s your job, Henry?

  --I’m a     . I work late. I’m very busy when people go out to dinners.

A. waiter      B. reporter      C. teacher      D. nurse

试题详情

41.(6分)有一种XX一88型号电水壶的铭牌如下表,图l5是电水壶的电路图,R为加热器,温控器S是一个双金属片温控开关,当温度较低时,其处于闭合状态,加热器加热。当水沸腾后,会自动断开进入保温状态,从而实现了自动温度开关控制。

若加热器电阻阻值随温度改变而发生的变化可忽略不计,则:

 (1)电水壶正常工作时,其加热电阻的阻值是多大?

 (2)若电水壶产生的热量全部被水吸收,现将一满壶23℃的水在标准大气压下烧开需要多长时间?[水的比热容C=4.2×103J/(kg·℃),lL=10-3m3]。

 (3)当电水壶处于保温状态时,通过加热器的电流是0.2A,此时电阻Rc的电功率是多少?

试题详情


同步练习册答案