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

<tbody id="hfoi4"></tbody>

單項選擇題

Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive（） the life of the ship.

A.along
B.will
C.throughout
D.for

你可能感興趣的試題

單項選擇題

The current flowing first in one direction and then in another is called（） current.

A.an alternating
B.a rush
C.a direct
D.an exciting

單項選擇題

Shore power must be（） during dock repair.

A.disconnected
B.switched off
C.cut off
D.connected

<pre id="m2umq"><acronym id="m2umq"></acronym></pre>

<sup id="m2umq"><pre id="m2umq"><div id="m2umq"></div></pre></sup><pre id="m2umq"><strong id="m2umq"><cite id="m2umq"></cite></strong></pre>