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洁净厂房是指在卫生条件上对建筑有特殊净化要求的厂房（）

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Students enrolled as full-time can fully____in the university extracurricular clubs.

A. had participated
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C. participating
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A. charge
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A. 用四氯化碳或 1211 灭火器灭火
B. 用沙土灭
C. 用水灭火

Excel Energy Corporation's new online training program has _______ （interact） features and forum discussions for trainees.