单项选择题
A.客梯 B.货梯或汽车梯 C.杂物梯
A.50mm B.1/2 C.500 D.1/3
A.±5％ B.±7％ C.±10％ D.±12％
A.≤0.01 B.≤0.02 C.≤0.1 D.≤0.2
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