问题
单项选择题
齿轮传动的效率达到（）
A、0.94～0.99
B、0.90～0.91
C、0.92～0.93
D、0.93～0.95
答案
参考答案：A
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齿轮传动的效率达到（）
A、0.94～0.99
B、0.90～0.91
C、0.92～0.93
D、0.93～0.95
参考答案：A
| 阅读下面对话，从方框内7个选项中选择5个恰当的句子完成此对话。 | |
| A: Hello, is that Wu Bin speaking? B: Yes. Who's that? A: This is Tian Hong. Are you free this Saturday evening? B： 1 A: I've got two tickets to Jay Chou's concert. 2 B: Certainly, I'd love to. He's my favourite singer. Thanks for your invitation. 3 A: Let's meet at the gate of the park at four o'clock. B: 4 I want to buy him a gift. A: OK. I'll get there at three. Shall we go to the shopping center to buy the gift? B: 5 See you then. A: See you.  1. _________ 2.__________ 3.__________4. _________ 5．_________ |