入风井巷及采掘工作面的风源含尘量不得超过()mg/?
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----- Would you mind my using your pen?---- -_______________.
A. Yes, please
B. Of course not
C. Yes, help yourself
D. Sorry, I don ’t
人民法院公开审理的行政案件,对涉及到商业秘密的案件,当事人申请不公开审理的,可以不公开审理()
I hope you will spend as much time as you can ________ your English.
A. to practice
B. practice
C. practicing
D. on practice
防坠落用品与登高器具、设备要()用
A. 酌情
B. 随意
C. 正确