普通螺纹的牙形角是( ),英制螺纹的牙形角是55。。A.50° B.55° C.6 发布时间:2017-12-20 07:05 │ 来源:www.tikuol.com 题型:单项选择题 问题: 普通螺纹的牙形角是( ),英制螺纹的牙形角是55。。A.50°B.55°C.60°D.65°
题型:单项选择题 Can you finish these books before 10 o'clock?Yes, I can.A.to readB.readC.readsD.reading 查看答案