how can you create good vacuum on the fresh water (FW) distiller ?

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相似问题和答案

第1题：

—_______ I return the book to the library this week?— No, you _______.You can keep it until the end of this month.

A.Must; needn’t

B.Can; can’t

C.May; mustn’t

D.Can; mustn’t

答案：A

第2题：

You don’t look________; you’d better see a doctor.

A.mice

B.well

C.kind

D.good

参考答案：B

第3题：

Must we clearn the room before we leave?No, you _______

A.mustn't

B.can't

C.needn't

参考答案：C

第4题：

This is very important. You_____remember to shut down your computer every

evenlng。

A. ought

B. need

C. must

D. can

参考答案C

第5题：

you， do， eraser， how， spell【连词成句）

________________________？

正确答案：
54. How do you spell eraser

第6题：

22．In the daytime， when you dive in the sea， you ________

A． can see everything green and blue

B． can- t be in danger

C． can catch nothing

D． can't see anything clearly

正确答案：A
22．A【解析】由第三段前两句可知在光照下，海里一切呈蓝色和绿色。

第7题：

“Must I finish my homework now?” “No, you() . But you() finish it this evening. ”

A. mustn’ t…must

B. needn’ t…must

C. can’ t…can

D. can’ t…must

参考答案：B

第8题：

－－Must we finish our homework now? －－No, you ______. You _______ finish it after school.

A.needn't , may

B.mustn't , may

C.can't , can

D.needn't , must

正确答案:A

第9题：

On Monday morning some teachers exchanged a few ().

A.how-are-yous

B.of how-are-you’s

C.how-are-you’s

D.of how are you

参考答案：B

how can you create good vacuum on the fresh water (FW) distiller ?

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