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【简答题】
当环境中CO 2 浓度增高,植物的光补偿点 ,当温度升高时,光补偿点 。
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反馈参考答案：
举一反三
【简答题】铁路车票分为（）票和附加票。
【简答题】废气再循环(名词解释)
【单选题】An EGR(exhaust gas recirculation废气再循环) valve may be used to control
A.
carbon monoxide.
B.
carbon dioxide.
C.
unburned hydrocarbons.
D.
oxides of nitrogen.
【单选题】The average tariff rates for manufactured goods have fallen significantly since 1950 and now stand at about _____.
A.
18%
B.
5.9%
C.
4.8%
D.
1.5%
【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
【简答题】铁路车票分为（ ）票和附加票两部分。
【单选题】_____ the oxygen content in the exhaust gas, _____ the combustion is.
A.
The lower / the worse
B.
The higher / the better
C.
The lower / the better
D.
The highest / the worst
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