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

<abbr id="9span"><output id="9span"><ruby id="9span"></ruby></output></abbr>

<ruby id="9span"><small id="9span"></small></ruby>

單項選擇題

Surface irregularities, such as erosion and pitting on injection pump plungers, will（）

A.increase ignition delay
B.affect fuel oil metering
C.affect engine performance at low speed
D.only disappear due to fuel oil abrasion

你可能感興趣的試題

單項選擇題

Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because （）

A.oil foaming will occur
B.large quantities of oil are consumed
C.lube oil viscosity is always decreased
D.corrosive by-products are usually formed

單項選擇題

When disassembling or assembling an injection pump plunger and barrel you should （）

A.keep the parts immersed in diesel fuel
B.always keep the plunger and barrel together
C.work over a linoleum-type surface
D.all of the above

<dl id="eleq7"></dl>

<dl id="eleq7"><strong id="eleq7"></strong></dl>

<pre id="eleq7"><pre id="eleq7"><cite id="eleq7"></cite></pre></pre>