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

<ruby id="4mgn0"></ruby>

<dl id="4mgn0"><strong id="4mgn0"></strong></dl>

單項選擇題

Valve overlap is the period during which （）.

A.the inlet valve is open
B.the exhaust valve is open
C.both valves are closed
D.both valves are open

你可能感興趣的試題

單項選擇題

Valve gear knocks are more easily located while the engine （）.

A.is running
B.stops
C.is repaired
D.lacks of oil

單項選擇題

VIT means （）

A.variable injection timing
B.variable inlet tonnage
C.vertical incoming tonnage
D.vertical inlet tank

<pre id="k7kxb"><strong id="k7kxb"></strong></pre><pre id="k7kxb"><acronym id="k7kxb"></acronym></pre>

<dd id="k7kxb"><acronym id="k7kxb"><code id="k7kxb"></code></acronym></dd>