题目内容

钢丝绳()长度内接头不得超过三个。

A. 1m
B. 2m
C. 3m
D. 4m

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齿轮在什么俏况下应进行更换?

椎管内血管畸形中最常见的是()

A. 动脉畸形
B. 静脉畸形
C. 毛细血管扩张症
D. 动静脉畸形
E. 混合性畸形

现代SCADA系统一般有哪几部分构成?

Backstays are().

A. running rigging leading aft from the masts
B. running rigging leading forward from the masts
C. standing rigging leading aft from the masts
D. standing rigging from the trees to the mast head

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