单选题4-3规格的绞辘,其动、定滑轮数分别为()A4,3;B3,3:C4,4;D3,4。
单选题
4-3规格的绞辘,其动、定滑轮数分别为()
A
4,3;
B
3,3:
C
4,4;
D
3,4。
参考解析
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