单项选择题
A.12% B.14% C.15.0% D.20%
A.BW B.HY C.JJ D.LSH
A.±0.5mm B.±0.7mm C.±0.8mm D.±1.0mm
A.2层,5层 B.3层,8层 C.3层,10层 D.4层,7层
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