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【单选题】
质量为 M 的物块以速度 v 运动 , 与质量为 m 的静止物块发生正撞 , 碰撞后两者的动量正好相等 , 两者质量之比M/m 可能为 ( ) A.3 B.4 C.5 D.6A.
B.
C.
D.
D
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【简答题】Match the English in Column A with their meanings in Column B.
【简答题】Match the English words in the left column with the English meanings in the right column.
【简答题】Match the English expressions in the left with the Chines meanings in the right.
【简答题】Match the English in Column A with their meanings in Column B.
【简答题】Match the English words or phrases in the left column with the English meanings in the right column.
【简答题】match the English words in the first colunm with the corresponding meaniing in the second column.
【简答题】Match the English words in the left column with the English meanings in the right column.
【简答题】鹅在世界范围内饲养很普遍,从其主要用途看,鹅的品种主要分为哪几种?
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