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攀登用的梯子不得缺档,().

单选题
2022-04-19 04:16
A、A.可以垫高使用
B、不得垫高使用
C、可以垫高使用,但应有保护
D、可以垫高使用,但应有人帮助
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正确答案
B

试题解析

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攀登用的梯子不得缺档,().
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