单选题
A ship must have a self-contained breathing apparatus to be used as protection from gas leaking from a refrigeration unit. To meet this requirement，you may use（）.
发布日期：2021-03-22
a gas mask certified by the Mine Safety and Health Administration
the same self-contained breathing apparatus required with the fireman's outfit
an oxygen breathing apparatus，provided that the device has been inspected within three years
a portable ventilation system that will provide a complete change of air every three minutes
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用一块积木代表电话，将小板凳当火车等，张开双臂跑代表飞机在飞，双脚并拢往前跳代表小兔子在跳，扮演妈妈、医生、司机、营业员、小白兔、卡通人物等称为（）。
劝说的语言艺术主要有诱导式、暗示式、顺水推舟式。
税收作为调节社会经济运行的一种重要经济杠杆，提高税率通常将（ ）。
关于培训与开发教师的说法，错误的是（ ）。
因科研等特殊需要，输入禁止进境物的快件，快件运营人报检时应提供（）签发的特许审批证明。
肠道病毒不包括（）
采用微内核结构的操作系统提高了系统的灵活性和可扩展性（）
可赎回债券和可售回债券的主要区别包括（）。
我国的外债管理体制的原则是（）
对通过函证无法证实的应收账款，注册会计师应当执行的最有效的审计程序是( )
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