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单选题

Irichloroethylene is a health hazard.

AA. When there is trichloroethylene, you shouldn‘t worry about it.

BB. Trichloroethylene is good for health.

CC. Trichloroethylene is hazard for health.

正确答案:A (备注:此答案有误)

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  • 单选题

    Irichloroethylene is a health hazard.

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