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

<ins id="qm9cf"><xmp id="qm9cf"></xmp></ins>

<ruby id="qm9cf"><output id="qm9cf"></output></ruby><sup id="qm9cf"><legend id="qm9cf"><s id="qm9cf"></s></legend></sup>

<pre id="qm9cf"><strong id="qm9cf"></strong></pre>

單項選擇題

Rotating flyweights acting against spring pressure make a simple type of （）.

A.governor
B.safety valve
C.reducing valve
D.feed water regulator

你可能感興趣的試題

單項選擇題

Remote control means that the system is being controlled by the operator who is situated （） from the system.

A.automatic
B.local
C.remote
D.manual

單項選擇題

Put in the engine turning gear Now examine thoroughly inside the crankcase to （） that everything is correct.

A.make sure
B.be sure
C.assure
D.believe