题目内容
（请给出正确答案）
Americans had been chewing gum since before Thomas Adams was born.
A．Right
B．Wrong
C．Not mentioned
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更多“Americans had been chewing gum since before Thomas Adams was born.A．RightB．WrongC．Not ment”相关的问题
As shown, object A and B with mass of m1 and m2 are put on a smooth surface of a table and they are connected through a light spring. Another two objects C and D are on objects A and B, and the frictional factors between A and C, B and D are not equal to zero. An external force pushes on A and B along the horizontal direction and the spring is compressed. As removing the external force during the process of A and B being apart away， for the system of A, B, C, D and the spring we have（ ）
A、Both momentum and mechanical energy are conserved;
B、Momentum is not conserved while mechanical energy is conserved;
C、Both momentum and mechanical energy are not conserved;
D、Momentum is conserved , while mechanical energy is not necessarily conserved.
A、The Glass Menagerie
B、Cat on a Hot Tin Roof
C、The Streetcar named Desire
D、Battle of Angels
A、Murder and rape
B、Castration and drug addiction
C、Homosexuality and alcoholism
D、All the above
A、Making bags
B、Making shoes
C、Making guns
D、Making underpants
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