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【单选题】
In order to keep the oil film on the cylinder liner during the running-in period, the piston rings are slightly rounded .A.
on both the external and internal top edges
B.
on both the external top and bottom edges
C.
on both the external and internal bottom edges
D.
on all the four edges
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举一反三
【单选题】What should be blamed according to the analysis in paragraph 3?
A.
Medicines and health care.
B.
Sleeping habits.
C.
Central heating system in most workplace.
D.
Lack of exercise.
【简答题】Cleaning of the pot: The pot for preparing herbal decoctions should be___________________________. This is to pr the residue frominterfering with Chinese herbal medicines to be decocted in the ne...
【简答题】《我与地坛》的作者是谁？
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