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

單項選擇題

The PRIMARY function of a waste heat boiler is to （）

A.reduce engine exhaust noise
B.reduce engine back pressure
C.recover heat which otherwise would be lost
D.increase turbocharger efficiency

你可能感興趣的試題

單項選擇題

The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）

A.direction of air flow within the cylinder
B.sequence of port opening
C.method of opening exhaust ports
D.volume of air admitted to the cylinder

單項選擇題

Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）

A.sulfite or hydrazine
B.sulfite or hygroscopic sulfite
C.bromide or hydrazine
D.bromide or hygroscopic sulfite