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="fkte0"><strong id="fkte0"></strong></pre>

<ins id="fkte0"></ins>

單項選擇題

Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.

A.possible
B.necessary
C.practicable
D.impracticable

你可能感興趣的試題

單項選擇題

A(n) （） is a mechanical attack on the metal surface which may be due to a disturbance in the flow of the water over the blade of the propeller.

A.erosion
B.corrosion
C.pitting
D.dezincification

單項選擇題

A (n) （） is a chemical or electro-chemical attack on the metal surface which may be further increased if the sea-water is polluted.

A.erosion
B.corrosion
C.cavity
D.scouring

<ruby id="n7wxy"><small id="n7wxy"></small></ruby>

<ins id="n7wxy"></ins>

<ruby id="n7wxy"><xmp id="n7wxy"></xmp></ruby>

<dl id="n7wxy"></dl>

<ins id="n7wxy"></ins>