Waterside scale in a fire-tube boiler may cause （）.

A distorted furnace in a fire-tube auxiliary boiler may be the result of （）A. fi

[单选题]Fusible plugs are installed in fire-tube boilers to （）.A . provide a means of draining the boilerB . warn the engineer of low water levelC . cool the crown sheet at high firing ratesD . open the burners electrical firing circuit

[填空题] （）接头用于Tube管和Tube管之间的连接。

[单选题]tube表示中文（）。A . 管子B . 圆棒C . 线材

[单选题]F．ire dampers prevent the fire spreading through the process ofA．convectionB．conductionC．radiationD．direct contact

[单选题]H．ow to operate boiler?

[名词解释] 音阶（Scale）

[名词解释] 鳞屑(scale)

—_____________________ — Fire, fire service please! Theres a huge fire here.A. 9

[单选题]The water in an auxiliary boiler should be tested for chloride content to determine ( ).A．total dissolved solidsB．salt contaminationC．water harcnessD．chlorine contamination