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【单选题】
钢板轧制时,咬入角α与摩擦角β之间应具有什么关系?A.
α≤β
B.
α=β
C.
α≥β
D.
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A.
It has less poverty, dirt and ignorance.
B.
The villagers treated him very friendly.
C.
It is cooler.
D.
It's a typical village.
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A.
Bad Teaching.
B.
Poverty.
C.
Hard labor.
D.
Age.
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