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="jbmjd"><strong id="jbmjd"></strong></pre>

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

單項選擇題

The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.

A.be jammed
B.be opened
C.be seated
D.be broken

你可能感興趣的試題

單項選擇題

The most common cause of lowering the crankcase lube oil flash point is （）.

A.more water contents
B.contamination with fuel oil
C.higher temperature
D.sufficient cooling of oil mist

單項選擇題

The mechanical efficiency of an engine （） because losses occur in the form of friction.

A.is always less than 100%
B.is always more than 100%
C.is always equal to 90%
D.is always less than 90%

<dd id="buhlh"></dd><pre id="buhlh"><strong id="buhlh"></strong></pre>

<sup id="buhlh"><legend id="buhlh"></legend></sup>