单选题
1分
Excessive return oil pressure from a variable capacity return flow fuel oil burner system on an auto...
Excessive return oil pressure from a variable capacity return flow fuel oil burner system on an automatic auxiliary boiler, will cause _______.
参考答案: B
参考解析: 自动辅锅炉可变回油式燃油燃烧系统的回油压力过大,会造成燃烧器冒黑烟。