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
参考答案:D
什么是LKJ系统故障关机率?
She was not the woman ________ she was before.
A.what
B.who
C.that
D.where