Ra3um的含义是()。 A.尺寸精度为3μm B.光洁度为3μm C.粗糙度为3μ 发布时间:2018-10-20 23:32 │ 来源:www.tikuol.com 题型:单项选择题 问题: Ra3um的含义是()。A.尺寸精度为3μmB.光洁度为3μmC.粗糙度为3μmD.位置精度为3μm
题型:单项选择题 —Got your driving license? —No. I ________ too busy to have enough practice, so I didn't take the driving test last week.A.wasB.have beenC.wereD.had been 查看答案