液压支架按架型结构及与围岩关系分为：掩护式支架、支撑掩护式支架、大倾角支架。（）
参考答案：错
超声波雾化器水槽内水温不能超过
A．40℃B．50℃C．60℃D．70℃E．100℃
—Could you tell me _______?
—Well, it will start at 9: 00 o'clock.[ ]
A. when the meeting will start
B. when will the meeting start
C. when the meeting starts
