【题目】下列日常洗涤操作中,是利用乳化的原理达到清洗目的的是 ( )
A.用自来水清洗蔬菜
B.用汽油清洗油污
C.用洗涤剂清洗餐具
D.用酒精清洗碘渍
科目:初中地理 来源: 题型:
【题目】 I decided to go with them, __________ I had nothing better to do.
A. though B. because C. so D. until
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科目:初中地理 来源: 题型:
【题目】下列对实验现象或结论的描述中错误的是( )
A.碘易溶于水
B.高锰酸钾几乎不溶于汽油
C.水和植物油混合后用力振荡可形成乳浊液
D.乙醇能与水互溶
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科目:初中地理 来源: 题型:
【题目】D
Simon is a student in a middle school. He is very strong. He goes to No.6 Middle School on a bus. He’s good at English. But he’s often late for his English classes. His father is a doctor. He’s big and tall. He works in a big hospital. His mother is a nurse. She’s slim and pretty. They are in the same hospital. They all work hard. He loves his father and mother very much. His father and mother both go to work by bike. We can see bikes here and there. And China is a "country of bikes".
【1】What is Simon?
A. He is very strong. B. He is a student.
C. He is a son. D. He is a doctor.
【2】How does Simon go to school?
A. By bike.
B. His father takes him to school every day.
C. On foot.
D. By bus.
【3】 What does Simon’s father look like?
A. He’s big. B. He works in a big hospital.
C. He’s tall. D. A and C.
【4】 Why do we say China is a "country of bikes"?
A. Because we all go to school by bike.
B. Because everyone in China likes bikes.
C. Because bikes can make us strong.
D. Because there are many bikes in China, we can see bikes here and there.
【5】Where does Simon’s parents work?
A. They work in the same hospital.
B. His father works in a big hospital, but his mother doesn’t.
C. His mother works in a big hospital, but his father doesn’t.
D. They both go to span>work by bike.
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【题目】下列有关溶液的说法中,正确的是( )
A.溶液都是无色透明的
B.溶液中的溶剂一定是水
C.均一、稳定的液体都是溶液
D.溶液都是由溶质和溶剂组成的
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【题目】 —Happy Halloween, Sandy!
—__________
A. Yes. I am very happy. B. Thanks. The same to you.
C. OK. You are right. D. Not at all.
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【题目】衣服上沾有碘很难洗净,碘在下列四种不同溶剂中的溶解性如下表所示:
溶质 | 碘 | |||
溶剂 | 水 | 酒精 | 汽油 | 苯(有毒) |
溶解性 | 微溶 | 可溶 | 易溶 | 易溶 |
由表中提供的信息判断,能最快洗净衣服上的碘污渍且对人体无害的是( )
A.水
B.酒精
C.汽油
D.苯
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科目:初中地理 来源: 题型:
【题目】一杯20℃的NaNO3溶液,能证明它是饱和溶液的是( )
A.蒸发10g水有NaNO3晶体析出
B.降低10℃时,有NaNO3晶体析出
C.加入10gNANO3晶体,仍有NaNO3晶体未溶解
D.在该温度下,加入少许NANO3晶体,晶体质量不减少
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