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【单选题】
一对外啮合渐开线标准斜齿圆柱齿轮的正确啮合条件是( )。A.
m n1 = m n2 = m ； α n1 = α n2 = α ； β 1 = β 2
B.
m n1 = m n2 = m ； α n1 = α n2 = α ； β 1 = - β 2
C.
m 1 = m 2 = m ； α 1 = α 2 = α ； β 1 = β 2
D.
m 1 = m 2 = m α 1 = α 2 = α ； β 1 = - β 2
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反馈参考答案：
举一反三
【简答题】Ecrivez les nombres en toutes lettres: 2 178 000 pages
【简答题】Ecrivez les nombres en toutes lettres: 500 étudiants
【判断题】To show his deep respect for Laozi, Legge put Tao Te Ching in the first place in his Chinese Classics translation series.
A.
正确
B.
错误
【简答题】1H =( )mH;1 H =( )μH。A. 1 B. C. D.
【单选题】The author uses the example of 'two melodies' (Para. 2)to______.
A.
show how deep and complex his music is
B.
explain why people today enjoy his music
C.
illustrate why Bach was a good music teacher
D.
teach readers how to combine two songs
【简答题】Ecrivez les nombres en toutes lettres: 1 300 000 000 habitants
【简答题】Ecrivez les nombres en toutes lettres: 199 kilogrammes
【简答题】Ecrivez les nombres en toutes lettres: 600 000 moutons
【简答题】Ecrivez les nombres en toutes lettres: 71 dollars
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