单项选择题
A.20sB.40sC.60sD.80s
A.0.12MPaB.0.22MPaC.0.32MPaD.0.42MPa
A.0.1mmB.0.3mmC.0.5mmD.0.7mm
A.7MPaB.14MPaC.28MPaD.54MPa
A.0.001〜0.018mmB.0.002〜0.028mmC.0.030〜0.038mmD.0.040〜0.048mm
A.0.1mmB.0.2mmC.0.3mmD.0.4mm
A.2种B.3种C.4种D.5种
A.2个B.3个C.4个D.5个
A.2条B.3条C.4条D.5条