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

<ruby id="ptdqn"><xmp id="ptdqn"></xmp></ruby>

<em id="ptdqn"></em>

單項(xiàng)選擇題

Backfire flame arrestors are installed on（）.

A.fuel tanks
B.spark plugs
C.carburetors
D.distributors

你可能感興趣的試題

單項(xiàng)選擇題

Automatic fire dampers in ventilation systems are operated by use of（）.

A.remotely operated valves
B.fusible links
C.C0₂ system pressure switches
D.heat or smoke detectors

單項(xiàng)選擇題

Automatic fire dampers in ventilation systems are operated by a（）.

A.remote operated valve
B.fusible link
C.CO₂ system pressure switch
D.heat or smoke detector

<dl id="b020f"></dl>

<pre id="b020f"><acronym id="b020f"></acronym></pre>

<ins id="b020f"></ins>

<pre id="b020f"><strong id="b020f"></strong></pre>