无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

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

<ruby id="usvju"></ruby>

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

<pre id="usvju"><strong id="usvju"></strong></pre><ruby id="usvju"><xmp id="usvju"></xmp></ruby>

單項選擇題

A diesel engine cylinder head can crack as a result of （）

A.a leaking seal ring
B.heat transfer from exhaust valves
C.restricted cooling passages
D.overheated intake valves

你可能感興趣的試題

單項選擇題

In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）

A.top of the ring groove
B.back of the ring groove
C.bottom of the ring groove
D.piston ring end clearance

單項選擇題

Diesel engine blow-by is the leakage of combustion gases past the （）

A.oil rings only
B.compression and scraper rings
C.cylinder liner sealings
D.cylinder liner ring grooves

<pre id="2p2fx"><strong id="2p2fx"></strong></pre>

<sup id="2p2fx"><legend id="2p2fx"><div id="2p2fx"></div></legend></sup>

<pre id="2p2fx"><legend id="2p2fx"><s id="2p2fx"></s></legend></pre>