无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

<dd id="h7pje"><acronym id="h7pje"></acronym></dd>

<pre id="h7pje"><strong id="h7pje"></strong></pre>

<dl id="h7pje"><legend id="h7pje"><input id="h7pje"></input></legend></dl>

單項選擇題

Which of the following procedures decreases the total dissolved solids concentration in the water of an auxiliary boiler?（）

A.Hydrazine treatment of condensate
B.Frequent compounding
C.Chemical cleaning
D.Bottom blowing

你可能感興趣的試題

單項選擇題

Failure of the burner flame in an auxiliary boiler would probably be a result of（）

A.water in the fuel oil
B.broken high tension leads
C.incorrect electrode setting
D.full fuel pressure at the nozzle

單項選擇題

Which action should be taken when an auxiliary boiler in is operation?（）

A.Clean all electrical connections
B.Lift the relief valves by hand
C.Inspect and clean all solenoid valves
D.Inspect for oil and water leaks