一般空气管的上口（），有的设有关闭盖或浮球式开关。A.做成180_爱下问搜题

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问题单项选择题

一般空气管的上口（），有的设有关闭盖或浮球式开关。

A.做成180°的弯头

B.做成90°的弯头

C.保持垂直

D.做成60°的弯头

答案

参考答案：A

单项选择题

紫外线体腔照射的剂量是体表的（）

A.1／2倍

B.1倍

C.1.5倍

D.2倍

E.以上都错

补全对话，情景问答

选择合适的句子完成对话（有一项多余）。

A: How about you?
B: What do you think of it?
C: Education is very important
D: Because I want to help the poor children
E: Which is your favorite charity?
F: Because it is a charity that helps blind people.

A: I used to spend all my pocket money on stickers . 1_______
B: I used to buy some story books . Now , I try to save some money to donate to charities .
A: 2_______
B: ORBIS. 3_______ I think it is very sad if you can't see anything . What about you ?
A: I often donate money to UNICEF . 4_______
B: Sometimes I also donate money to it with my classmates. 5_______
A: Yes, let's save our money to help the people in need .