问题
单项选择题
一对渐开线齿轮啮合时，其节圆压力角（）。
A.等于啮合角
B.大于啮合角
C.小于啮合角
D.等于压力角
答案
参考答案：A
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一对渐开线齿轮啮合时，其节圆压力角（）。
A.等于啮合角
B.大于啮合角
C.小于啮合角
D.等于压力角
参考答案：A
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| Mrs. Green lives in the country, and she doesn't know London very well. One day, she goes to London, but she can't find her 1 . Just then, she 2 a man near the bus stop. " I can ask him the way." she says to 3 . Then she goes over to the man and asks, "Excuse me, will you please 4 me the way to King Street?" The man smiles with 5 answer. He 6 know English. He speaks Russian. He is a visitor. Then he 7 his hand into his pocket (衣袋), takes out 8 and lets her 9 it. On the paper are these words, "Sorry, I can't 10 English." | ||||
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