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【单选题】
一对渐开线外啮合斜齿圆柱齿轮的正确啮合条件是 ____ 。A.
mn1=mn2=m,αn1=αn2=α,β1=-β2
B.
mn1=mn2=m,αn1=αn2=α,β1=β2
C.
mn1=mn2=m,αn1=αn2=α
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举一反三
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B.
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C.
实现了中日关系正常化
D.
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D.
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E.
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