锤击式碎煤机振动超标的原因及处理方法是什么? 发布时间:2017-10-24 07:20 │ 来源:www.tikuol.com 题型:问答题 简答题 问题: 锤击式碎煤机振动超标的原因及处理方法是什么?
题型:问答题 简答题 ― the shop for several years?―No, it one year ago.[ ]A. Has; been open; opened B. Is, opened; openedC. Has, opened; was open D. Was, opened; was opened 查看答案