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    【题目】Protective clothing must be worn when the machine is in _________.

    A. orderB. operation

    C. lineD. public

    【答案】B

    【解析】

    考查名词词义辨析。句意：在操作机器的时候必须要穿防护服。A. order命令，顺序；B. operation运行；C. line直线；D. public公共。本句为短语in operation运行之中，故选B。

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