问题描述：
[单选]
The purpose of the safety relief valves installed on an auxiliary boiler is to（）．
A．relieve excess fuel oil pressure during the “off” fire cycle
B．admit water to the dry pipe
C．throttle the forced draft fan output for proper combustion
D．reduce excess steam pressure in the boiler
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：The most common contaminate of governor hydraulic fluid is（）．
下一篇：The pH value of water in a diesel engine closed cooling water system should be maintained between（）．
- 我要回答: 网友(216.73.216.96)
- 热门题目: 1.液压拉伸器的液系统中应使用纯 2.当液压拉伸器的用油变质时，应 3.液压拉伸器液压系统中绝对不可