皮带机胶带的拉紧方法有重物拉紧和()拉紧两种。 A.机器 B.电机 C.人力 D.机 发布时间:2018-05-08 03:50 │ 来源:www.tikuol.com 题型:单项选择题 问题: 皮带机胶带的拉紧方法有重物拉紧和()拉紧两种。A.机器B.电机C.人力D.机械
题型:单项选择题 To ______ good relationships with your teachers and classmates, you should learn to share ups and downs with them.A.bring upB.add upC.keep upD.take up 查看答案