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="rufwa"><output id="rufwa"></output></ruby>

單項選擇題

The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.

A.the same piston
B.the piston nearby
C.the other pistons
D.the generators on board

你可能感興趣的試題

單項選擇題

The efficiency of turbocharge system is increased by fitting a charge air cooler （） the compressor.

A.inside
B.before
C.after
D.against

單項選擇題

The distance from TDC to BDC of the diesel engine is called （）.

A.gap
B.clearance
C.radius
D.stroke

<pre id="hlav4"><legend id="hlav4"></legend></pre>

<ins id="hlav4"></ins>