相关考题
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单项选择题
The students and graduates（）to raise money when the gym burned down.
A.put in force
B.joined forces
C.joined forces with
D.come into force -
单项选择题
I am sure you’d be the first to be sorry if anything was to（）him.
A.happen on
B.happen to
C.happened to
D.happen upon -
多项选择题
光气及光气化产品生产装置区域必须设置（）检测及超限报警仪表，还应设置事故状态下能自启动紧急停车和应急破坏处理的自控仪表系统。
A、光气
B、氯气
C、氧气
D、一氧化碳
