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【简答题】一对啮合的标准直齿圆柱齿轮( =20o,ha* =1)。已知Z1 =30, Z2=90,m=5mm.试求这对齿轮的分度圆直径, 齿顶圆直径, 齿根圆直径, 传动比和中心距。
【单选题】The author cites the case of Johann Bachofen mainly to ______.
A.
show the value of studies on pre-modern women' s status
B.
justify the unchallenging works of earlier scholars
C.
present to readers an ancient women-ruled community
D.
prove the difficulty in the research of pre-modern cultures
【单选题】Johann Strauss, as a composer, was more successful and popular than his father.
A.
very
B.
so
C.
even
D.
too
【简答题】有一对相互啮合的标准直齿圆柱齿轮Z 1 ＝40，Z 2 ＝80，求其传动比。 已知：Z 1 ＝40，Z 2 ＝80。 求：i
【简答题】Johann Gutenberg, who worked as a goldsmith(金匠)，took what has already been discovered, and created a small invention that changed history. He created a machine that allowed him to move small blocks of...
【简答题】已知相啮合的一对标准直齿圆柱齿轮, z 1 =20 , z 2 =50 , a=210mm 。求两齿轮的分度圆直径 d 1 和 d 2 。
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