99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項選擇題

The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.

A.principle
B.principal
C.cause
D.case

你可能感興趣的試題

單項選擇題

The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.

A.two-stroke
B.four-stoke
C.long-stroke
D.short-stroke

單項選擇題

The main moving parts of a diesel engine consist of the （） and the pistons.

A.bedplate, connecting rods
B.crankshaft, the connecting rods
C.frames, crossheads
D.crankshaft, the cylinder

<ruby id="kkm28"><xmp id="kkm28"></xmp></ruby>