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高层建筑火灾在竖向管井、共享空间处的火势易“跳跃式”向上蔓延（）

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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（）

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

A. had participated
B. participant
C. participating
D. participate

If you get your bank to generate a money order, it usually ______ conversion fees.

A. charge
B. charges
C. charging
D. is charging

电器着火时，下列不能用的灭火方法是哪种（）

A. 用四氯化碳或 1211 灭火器灭火
B. 用沙土灭
C. 用水灭火