问题
单项选择题
在使用氧气瓶时，其工作压力为（）MPa左右。
A.16
B.20
C.0.5
D.18
答案
参考答案：C
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在使用氧气瓶时，其工作压力为（）MPa左右。
A.16
B.20
C.0.5
D.18
参考答案：C
| 补全对话，从方框中选择最佳选项完成对话，有两项多余。 | |
B: Yes. 1 A: That will be a pity if you only stay at home in such fine weather. B: 2 A: What about going to the East Lake this afternoon? It's a great place for fun. B: 3 didn't you? A: It's true. We have invited four friends to go there. If you like, 4 B: Er, I'd better ask my mother first, OK? A: Sure. We' ll wait for you till 12 at noon. Please call me if you go, 5 B: OK. Thanks! I will. 1._______2.________3.______4._______5.________ |