【单选题】有一直齿圆柱齿轮,m=4,z=36,它的齿高为 。
【单选题】已知一对外啮合标准直齿圆柱齿轮的标准中心距a=160,齿数Z1=20,Z2=60,计算这对齿轮的模数。
【单选题】有一直齿圆柱齿轮,m=4,z=36,它的分度圆直径为 。
【单选题】有一直齿圆柱齿轮,m=4,Z=36,它的分度圆直径d为( )。
【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】有一直齿圆柱齿轮,m=4,Z=36,它的分度圆直径为( )mm。
【单选题】有一直齿圆柱齿轮,m=4,Z=36,它的分度圆直径为( )mm。
【单选题】Johann Strauss, as a composer, was more successful and popular than his father.
【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...