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

<pre id="lybom"><pre id="lybom"><div id="lybom"></div></pre></pre>

單項(xiàng)選擇題

In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.

A.water-tube
B.fire-tube
C.exhaust gas
D.None of the above is true

你可能感興趣的試題

單項(xiàng)選擇題

In a （） boiler the water flows through the inside of the tubes while the hot gases pass around the outside.

A.water-tube
B.fire-tube
C.exhaust gas
D.none of the above

單項(xiàng)選擇題

The tube in a boiler should be blinded if found （）.

A.scaled
B.informed
C.leaky
D.deformed

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

<dl id="eekwj"><legend id="eekwj"><thead id="eekwj"></thead></legend></dl>

<ins id="eekwj"></ins>