试题与答案

(8分)实验室需要0.1 mol/L NaOH溶液450 mL。根据这种溶液的配

题型:实验题

题目:

(8分)实验室需要0.1 mol/L NaOH溶液450 mL。根据这种溶液的配制情况回答下列问题:

(1)如图所示的仪器中配制溶液肯定不需要的是   (填序号),本实验所需玻璃仪器E规格为        mL。

(2)下列有关容量瓶的说法中,不正确的有     (填序号)。

A.能配制一定体积准确浓度的标准溶液

B.可长期贮存溶液

C.能用来加热溶解固体溶质

D.使用前必须检查是否漏水(3)在配制NaOH溶液实验中,其他操作均正确。若定容时仰视刻度线,则所配制溶液浓度

           0.1 mol/L(填“大于”“等于”或“小于”)。

答案:

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can help them find you by staying in one place. There is another way to help your friends or other people to

find you. You can shout or whistle (吹口哨) three times. Stop. Then shout or whistle three times again. Any

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    Keep up shouting or whistling. Always three times together. When people hear you, they will know that

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     If you don't think that you will get help before night comes, try to make a little house with branches

(树枝), make yourself a bed with leaves and grass.

     When you need some water, you have to leave your little branch house to look for it. Don't just walk away.

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the most important thing to do is to stay in one place.

1. If you get lost in the forest, you should _________.

A. try to find your friends

B. stay in one place and signal (发信号)

C. walk around the forest

2. Which signal is a call for help?

A. shouting here and there

B. crying twice

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3. When you hear two shouts or two whistlings, you know that _________.

A. someone is afraid of an animal

B. people will come to help you

C. someone needs help

4. What's the meaning of the underlined sentence? (画线句子)

A. Leave branches to find your way back

B. Pick off branches to build another house

C. Use branches to make a bed

5. The main (主要的) idea of the passage is _________.

A. how to travel in the forest

B. what you should do if you want to get some water

C. what you should do if you are lost in the forest

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