tube表示中文（）。

[填空题] （）接头用于Tube管和Tube管之间的连接。

[单选题]thick表示中文（）。A . 厚度B . 长度C . 光洁度

[单选题]turning表示中文（）。A . 磨削B . 车削C . 刨削

[单选题]loop表示中文（）。A . 卷取机B . 张力C . 活套

[单选题]crack表示中文（）。A . 粗糙B . 裂纹C . 缺陷

[单选题]In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）A . The safety valve escape piping should be disconnected from the valve

[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

[名词解释] 燃料运输通道 fuel transfer tube

[单选题]Waterside scale in a fire-tube boiler may cause （）.A . increased heat transferB . fireside erosionC . high steam demandD . overheated tube

[单选题]Tube管的连接方式通常为（）A . 法兰连接B . 螺纹连接C . 焊接连接D . 卡套连接