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

單項選擇題

The pressure of pilot air is usually （） than that of starting air.

A.higher
B.lower
C.low
D.high

你可能感興趣的試題

單項選擇題

The power generated in the turbine must （） that required by the compressor.

A.be less than
B.be larger than
C.be as large as
D.not be so large as

單項選擇題

The position of the piston parts in relation to each other is secured by means of （） and a dowel pin in the crown.

A.bosses
B.through bolts
C.machine-turned recesses
D.long studs

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

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