单项选择题
A.小于15mm B.小于16mm C.小于17mm D.小于18mm
A.不大于3mm B.不大于4mm C.不大于5mm D.不大于6mm
A.15% B.20% C.30% D.40%
A.2h内 B.2h外 C.4h内 D.4h外
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