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【单选题】
图示轴颈1在驱动力矩Md作用下等速运转，Q为载荷，图中半径为ρ的细线圆为摩擦圆，则轴承2作用到轴颈1上的R21中所示的 作用线。【图片】A.
A
B.
B
C.
C
D.
D
E.
E
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举一反三
【单选题】Most publishing is now 'electronic' in the sense that books, magazines, and newspapers are prepared on computers, and exist as computer files before they are printed on paper. Often there are advantag...
A.
Readers will have more accesses.
B.
Books and newspapers will be kept as computer files.
C.
It will not make any sense to keep the printed versions.
D.
Electronic publications will replace printed ones.
【简答题】The survey on the publishing market concludes that two thirds of print books will give way to digital ones in three years.
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