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问题:

[单选] Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear ().

A . face shield
B . a respirator
C . rubber gloves
D . an all purpose gas mask

The invariable result of()average is that the loss falls on the owner of the particular property which has suffered the damage,whether that damage was due to deliberate sacrifice or to an accident. special。 particular。 general。 total。 程控交换机的联机程序和脱机程序分别包括哪些? 使蛋白质变性沉淀的因素有() 加入中性盐。 剧烈搅拌。 加入乙醇。 加热。 《八十天环游地球》中路路通急中生智,装扮成死而复生的土司,救走了艾娥达。 《古潭的声音》的场景是哪里?() 剧院。 原野。 卧室。 郊外。 Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear ().
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