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【单选题】
(2011年)平面机构具有确定运动的充分必要条件为( )。A.
自由度大于零
B.
件大于零
C.
件数大于自由度数
D.
件数等于自由度数，且大于零
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皮皮学刷刷变学霸
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【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】杀菌性抗结核药为
A.
异烟肼、利福平、乙胺丁醇
B.
异烟肼、链霉素、乙胺丁醇
C.
异烟肼、利福平、乙硫异烟胺
D.
异烟肼、利福平、链霉素、吡嗪酰胺
E.
异烟肼、吡嗪酰胺、氨硫脲
【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】废气再循环控制(名词解释)
【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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