【单选题】An EGR(exhaust gas recirculation废气再循环) valve may be used to control
C.
unburned hydrocarbons.
【单选题】An exhaust gas bypass is installed on a waste heat boiler in order to ().
A.
bypass exhaust gas at high loads to prevent excessive back pressure
B.
bypass a portion of the exhaust gas at peak loads for better efficiency
C.
recycle exhaust gas to the turbocharger
D.
minimize moisture condensation in the boiler gas passages at low loads
【判断题】exhaust gas turbochargers 意思是废气涡轮增压器。()
【单选题】_____ the oxygen content in the exhaust gas, _____ the combustion is.
B.
The higher / the better
C.
The lower / the better
D.
The highest / the worst
【单选题】异烟肼保存不当要变质,产生毒性较大的()