单项选择题
A.18个B.20个C.21个D.23个
A.5minB.10minC.12minD.15min
A.130+0-0.025mmB.130+0.005-0.02mmC.130+0.005-0.025mmD.130+0.005+0mm
A.230+0-0.013mmB.230+0-0.015mmC.230+0-0.02mmD.230+0-0.025mm
A.0.01mmB.0.015mmC.0.020mmD.0.025mm
A.58.8~196kNB.58.8~215.6kNC.49~215.6kND.98~215.6kN
A.8.8级B.8级C.10级D.10.9级