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

<p id="uofby"><address id="uofby"></address></p>

單項(xiàng)選擇題

Certain requirements must currently be met by a ship’s steering system.There must be （）independent means of steering, although where two identical power units are provided, an auxiliary unit is not required.

A.one
B.two
C.three
D.four

你可能感興趣的試題

單項(xiàng)選擇題

In the variable delivery pump, moving the spindle more from the central point will cause （） fluid to be pumped and consequently （）pressure is generated to drive the rams.

A.more；more
B.more；less
C.less；more
D.less；less

單項(xiàng)選擇題

The required rudder angle is transmitted hydraulically or electrically from the steering wheel at the bridge to the （）at the steering gear, just above the rudder.

A.transmitter
B.tele-motor
C.hydraulic ram
D.hydraulic cylinder

<del id="y3lcc"><i id="y3lcc"></i></del>

<optgroup id="y3lcc"><i id="y3lcc"></i></optgroup>

<source id="y3lcc"></source>

<ins id="y3lcc"><sub id="y3lcc"></sub></ins>

<b id="y3lcc"><strike id="y3lcc"><pre id="y3lcc"></pre></strike></b>

<strong id="y3lcc"></strong>

<nav id="y3lcc"><address id="y3lcc"></address></nav>