单项选择题
A.6-10B.10-20C.12-24D.24-30
A.石棉水泥B.膨胀水泥C.橡胶圈滑入式D.楔形橡胶圈
A.0.001-0.003B.0.002-0.004C.0.003-0.005D.0.004-0.006