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="529o7"><legend id="529o7"></legend></pre>

<strong id="529o7"><li id="529o7"><b id="529o7"></b></li></strong>

單項選擇題

Oil water separators are used to ensure that ships dont discharge oil when pumping out （）.

A.ballast water
B.boiler water
C.bilge water
D.sewage water

你可能感興趣的試題

單項選擇題

（）are used to ensure that ships don’t discharge oil when pumping out oily water from any oil contaminated space.

A.Boiler
B.Incinerator
C.Oily water separator
D.Sewage treatment unit

單項選擇題

High-speed rotation in a centrifugal purifier can produce a force （） the force of gravity.

A.many thousand times larger than
B.the same as
C.many thousand times smaller
D.none of the above

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