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

<pre id="0vbdq"><strong id="0vbdq"></strong></pre>

<pre id="0vbdq"><acronym id="0vbdq"><cite id="0vbdq"></cite></acronym></pre>

單項(xiàng)選擇題

A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）

A.low TBN value
B.high alkaline reserve
C.low flash point
D.high pour point

你可能感興趣的試題

單項(xiàng)選擇題

In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move（）

A.up and draw in a fresh air charge
B.down to burn off fuel
C.down to compress the fuel air charge
D.up and force out the exhaust gases

單項(xiàng)選擇題

A fuel injection valve opening at pressure lower than normal will result in（）.

A.late fuel injection
B.early fuel injection
C.high exhaust temperature from that cylinder
D.decreased effective stroke from that injector