【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,它的分度圆直径为( )。
【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 Fust probably helped Gutenberg by
A.
providing experiment equipment
【简答题】Johann Gutenberg, who worked as a goldsmith (金匠), took what had already been discovered, and created a small invention that changed history. He created a machine that allowed him to move small blocks ...
【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...