The soot blowers are operating in the oil fuel boiler the air/fuel ratio must _____ throug

The soot blowers are operating in the oil fuel boiler the air/fuel ratio must _____ throughout the action, and blowers greased after use.

A.be increased

B.be decreased

C.remain constant

D.either be increased or remain constant

请帮忙给出正确答案和分析，谢谢！

您可能感兴趣的试题

The domestic fresh water pump starters are controlled by pressure switches which operate w

答案解析
When considering the lowest fuel system operating temperature, _____ are important.A.speci

答案解析
After received the “finished with engine” instruction, which of the following operations i

答案解析
听力原文：（A) The oven operates with gas. （B) Two men are making repairs. （C) Both men are

答案解析
What is suggested about the telephone operators？A．They are busy.B．They are on a business t

答案解析
●The two goals of an operation system are（71）and efficiency. （71）A.convenience B.quick C.o

答案解析
Passage 1Questions 1 to 5 are based on the following passage:In the past operations were

答案解析