无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

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

<abbr id="ytjez"></abbr>

單項選擇題

A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.

A.damage from crane operations
B.being used for wash down purposes
C.accidental diversion of flow to wrong location
D.freezing

你可能感興趣的試題

單項選擇題

A combustible gas indicator meter is calibrated to read the percentage of（）.

A.vapor to oxygen
B.the flammable limit concentration
C.the autoignition concentration
D.the lower explosive limit concentration

單項選擇題

A class C fire would be burning（）.

A.fuel oil
B.wood
C.celluloid
D.electrical insulation

<blockquote id="e2t7e"></blockquote>

<dd id="e2t7e"></dd>