飞机液压油箱的正常抽油口位置往往高于应急抽油口，这种设计的目

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问题单项选择题

飞机液压油箱的正常抽油口位置往往高于应急抽油口，这种设计的目的是：（）.

A.当正常供油管路或附件泄漏时，油箱内仍会存留足够的油液用于应急供油

B.将正常供油和应急供油相对隔离，使它们抽油时不会相互干扰

C.满足正常供油压力大，而应急供油压力相对较小的要求

D.满足正常供油量较小，而应急供油所需油量较大的要求

答案

参考答案：A

情景交际

根据对话内容,从对话后的选项中选出能填入空白处的最佳选项。

— What seems to be the problem?

— 1

— How long have you been like this?

— Since Saturday night.

— _2

— Yes, I also feel lighthearted.

— Can you think of anything you ate Saturday that might have caused it?

— All I can think of is the fish I had. It didn't taste quite right.

— 3 Now I'll give you some medicine. Take it and you should be feeling better soon.

— 4

— I also suggest that you follow a special diet.

— 5

— You should stick to eating lighter foods.

A. What's that?

B. That might be it.

C. Thank you, doctor.

D. Any other problems?

E. I have a running nose.

F. Have you seen a doctor?

G. I have a terrible stomachache.

填空题

对血液循环起主要作用的脏除心脾外，还有____和____。