装置紧急停车联锁启动后，可使聚合系统（）等联锁启动。A、环管

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问题多项选择题

装置紧急停车联锁启动后，可使聚合系统（）等联锁启动。

A、环管反应器紧急停车联锁

B、环管反应器底部紧急出料联锁

C、紧急向环管反应器注入阻聚剂联锁

D、至三乙基铝计量罐进料联锁

答案

参考答案：A, B, C, D

选择题

Tommy was planning to buy a car the next week,______ he ______ enough for a used one．

A．by that time; had saved

B．by which time; had saved

C．by that time; saved

D．by which time; has saved

单项选择题

设计无要求时，住宅浴室的防水层高度不得低于（）。

A．1800mm

B．1500mm

C．1200mm

D．900mm