单项选择题
A.25% B.50% C.75% D.100%
A.±1% B.±2% C.±3% D.±5%
A.不小于60% B.不小于70% C.不小于80% D.不小于90%
A.1.2M B.1.8M C.2.5M D.一个整层高
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