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【单选题】
It may be inferred from this passage that_______.A.
many of the opponents of seat belt installation are parents and officials of the Department of Transportation
B.
proposal of seat belts on school buses would be seriously considered
C.
an alternate safety device (raising seat backs four inches) may be taken into consideration
D.
The Department of Transportation may either take the idea of seat belts or other measures when it reviews the whole situation
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【单选题】In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the____________.
A.
exhaust manifold
B.
valve bridge
C.
pressure of the fresh air charge
D.
valve adjusting gear
【简答题】实验需要0.10mol/LNaOH溶液470mL，根据溶液配制中情况回答下列问题： （1）实验中除了托盘天平、烧杯、玻璃棒、量筒、药匙外还需要的其它仪器有： 。 （2）根据计算得知，所需NaOH的质量为 g。 （3）定容时，待容量瓶中溶液的凹液面正好与刻度线相切，盖好瓶塞后的下一步操作是 。 （4）定容时,若加入的水超过刻度线，必须采取的措施是： 。 （5）下列操作对所配浓度有何影响（填写字母） ...
【单选题】Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to ________.
A.
increase the liner area covered by the oil film
B.
maintain an oil film on the lower liner where scuffing is prevalent
C.
keep excess oil away from intake and exhaust ports
D.
help cushion piston skirt side thrust by providing a hydrodynamic oil wedge
【简答题】实验需要0.10mol/LNaOH溶液470mL，根据溶液配制中情况回答下列问题： （1）实验中除了托盘天平、烧杯、玻璃棒、量筒、药匙外还需要的其它仪器有：______． （2）根据计算得知，所需NaOH的质量为______g． （3）定容时，待容量瓶中溶液的凹液面正好与刻度线相切，盖好瓶塞后的下一步操作是______． （4）定容时，若加入的水超过刻度线，必须采取的措施是：______． （5）...
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