单项选择题
A.5sB.10sC.12sD.15s
A.1m/sB.1.5m/sC.2m/sD.2.5m/s
A.5B.6C.7D.8
A.5minB.10minC.2hD.24h
A.10%B.15%C.20%D.25%
A.C1B.C2C.B1D.B2
A.1.0B.1.1C.1.2D.1.5
A.10%B.20%C.50%D.全数抽查
A.8hB.12hC.24hD.72h
A.5mB.8mC.10mD.13m