單項選擇題

The bypass valve on a self-contained breathing device should be opened if（）.

A.you are entering a space containing poisonous vapors
B.you are entering a space containing explosive gases
C.the regulator of the breathing apparatus malfunctions
D.the face piece of the breathing device is too tight

你可能感興趣的試題

單項選擇題

The boat is stowed on the davit rather than on a cradle with which type of davit?（）

A.Crescent
B.Sheath-screw boom
C.Quadrantal
D.Radial

單項選擇題

Static electricity may be built up by the（）.

A.flow of petroleum through pipes
B.spraying or splashing of petroleum
C.settling of solids or water in petroleum
D.All of the above

97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区 狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

The bypass valve on a self-contained breathing device should be opened if（）.

你可能感興趣的試題

The boat is stowed on the davit rather than on a cradle with which type of davit?（）

Static electricity may be built up by the（）.

97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久