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只要能够确保安全，非电工也可以拆装、修理电气设备和用具（）

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氯乙烯尾气经变压吸附处理后,氯乙烯和乙炔的回收率可达到%以上,放空气体中组成:氯乙烯≤45mg/？、乙炔≤120mg/？,可以达到国家环保合格排放标准（）

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You that letter to James. However ，yo didn't（）.

A. ought to write
B. ought to have written
C. should write
D. should be writing

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对于“事故苗头”应该采取什么态度（）

A. 要重视对“事故苗头”的分析
B. 对于“事故苗头”可采取无所谓态度
C. “事故苗头”又不是事故，何必大惊小怪，注意点就是了

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Although SPanish， he attended the course.（）

A. he was knowing B. he is knowing C. having a knowledge of D. knows
B. he was knowing B. he is knowing C. having a knowledge of D. knows
C. he was knowing B. he is knowing C. having a knowledge of D. knows
D. he was knowing B. he is knowing C. having a knowledge of D. knows

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