单项选择题
A.0.5m B.1.0m C.1.5m D.2.0m
A.0.5 B.0.4 C.0.2 D.0.3
A.0.5 B.0.6 C.0.7 D.0.8
A.-7%~+7% B.-10%~+7% C.-7%~+10% D.-5%~+5%
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