问题描述：
[单选]
Fusible plugs are installed in fire-tube boilers to（）．
A．provide a means of draining the boiler
B．warn the engineer of low water level
C．cool the crown sheet at high firing rates
D．open the burners electrical firing circuit
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：Friction developing between the moving parts of a governor， governor linkage and control valve will cause the governor to（）．
下一篇：What preventative maintenance should be done frequently to diesel engine starting air receivers？
- 我要回答: 网友(216.73.216.96)
- 热门题目: 1.排气阀阀杆磨损超过标准要求时 2.排气阀阀面磨损严重时，采用（ 3.排气阀阀面磨损较轻时可进行（