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

<pre id="evyl1"></pre>

<pre id="evyl1"><legend id="evyl1"></legend></pre>

<ins id="evyl1"></ins>

單項(xiàng)選擇題

（） is the temperature at which a liquid fuel gives off sufficient vapor to form an ignitable mixture near its surface.

A.Setting point
B.Dew point
C.Flash point
D.Lean point

你可能感興趣的試題

單項(xiàng)選擇題

A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.

A.purifies
B.combinations
C.concentrations
D.filters

單項(xiàng)選擇題

Deficiencies in the categories of Life-saving, Safety in General, Fire-fighting Appliances and Load Line （） approximately 66% of all deficiencies.

A.account as
B.account for
C.account to
D.account of

<dl id="behl2"></dl>