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【单选题】
普通圆柱蜗杆和蜗轮传动的正确啮合条件是A.
m t1 =m a2 , α t1 = α a2 , λ = β
B.
m a1 =m t2 , α a1 = α t2 , λ = β
C.
m t1 =m a2 , α t1 = α a2 , λ = - β
D.
m a 1 =m a2 , α a1 = α t2 , λ = - β
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举一反三
【单选题】-- Could you please buy me an MP4 as well as a digital camera, Mum? -- You can choose , not both, my dear.
A.
each
B.
any
C.
either
D.
none