问题描述：
[单选]
The rate of heat transfer in a water-tube auxiliary boiler can be increased by（）．
A．operating the boiler at less than normal water level
B．installing fins on the firesides of water-tubes
C．increasing the amount of excess air to the burners
D．treating the boiler water with chemical oxygen scavenger
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：Immediately after any diesel engine is started， the engineer should check the（）
下一篇：The term “proper metering”， as applied to a diesel fuel injection system， can be best defined as（）．
- 我要回答: 网友(3.147.52.243)
- 热门题目: 1.船舶由全速前进到开始倒航所滑 2.体现主机紧急倒车性能的指标是 3.主机起动用的空气瓶至少应有2