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【单选题】
平行轴外啮合 渐开线 标准斜齿圆柱齿轮的正确啮合条件是 ____。A.
mt 1 ＝ mt 2 ， αt 1 ＝ αt 2 ， β 1 ＝ β 2
B.
mn1＝mt2，α1＝α2，－β1＝β2
C.
mn 1 ＝ mn 2 ， αn 1 ＝ αn 2 ， β 1 ＝－ β 2
D.
mt 1 ＝ mt 2 ， α 1 ＝ α 2 ， β 1 ＝ β 2
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举一反三
【单选题】What’s the relationship between“John’S uncle bought a new car yesterday”and“John has an uncle”?
A.
Entailment．
B.
Contradiction．
C.
Tautology．
D.
Presupposition．
【单选题】What does John mean?
A.
John may go with Kate.
B.
Nobody can go with John.
C.
Kate has to go by herself.
【单选题】When John Nash went into his mental illness, he didn't realize that ______.
A.
he was quite alerted
B.
he was enlightened
C.
it was mental illness
D.
it was in a movie
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