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【简答题】
一 标准直齿圆柱齿轮分度圆上的齿距 P =15.7mm , 齿顶圆 直径 d a =400mm , 则该齿轮的齿数为 。
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【简答题】We plant trees in spring every year.
【单选题】To avoid the mistakes of our forefathers, the author suggests that______.
A.
we plant more trees
B.
we return to nature
C.
natural sciences be taught to everybody
D.
environmental education be directed toward everyone
【简答题】在地形图上确定某点的高程依据是( )。
【单选题】To avoid the mistakes of our forefathers, the author suggests that ______.
A.
we plant more trees
B.
we return to nature
C.
natural sciences be taught to everybody
D.
environmental education be directed to everyone
【单选题】To avoid the mistakes of our forefathers, the author suggests that______.
A.
we plant more trees
B.
natural sciences be taught to everybody
C.
environmental education be directed toward everyone
D.
we return to nature
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