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【简答题】
一质量为 m的小球从某一高度处水平抛出,落在水平桌面上发生弹性碰撞.并在抛出1s后,跳回到原高度,速度仍是水平方向,速度大小也与抛出时相等.小球与桌面碰撞过程中,桌面给予小球的冲量的大小为_______,________。 在碰撞过程中, 小球的动量是否守恒 ________(答“是”或“否”)。
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反馈参考答案：
举一反三
【单选题】针对企业的战略和核心业务、核心能力、价值观等对企业运营产生重要影响的内容而进行的专项培训，最适合选用的培训类型是( )
A.
岗前培训
B.
在岗培训
C.
离岗培训
D.
业务自学
【单选题】听力原文：M: I am so relieved, I just finished the story I was working on for our creative writing course. W: I haven't quite finished mine yet. I had trouble getting past the beginning. M: How come? W: We...
A.
A detective story.
B.
Their writing assignment.
C.
Professor Wilson's writing course.
D.
A jewelry store robbery.
【单选题】听力原文：M: I am so relieved, I just finished the story I was working on for our Creative writing course. W: I haven't quite finished mine yet. I had trouble getting past the beginning. M: How come? W: We...
A.
Her professor did not like her story.
B.
She had trouble finishing her assignment.
C.
She did not like the topic she had chosen for her paper.
D.
She was taking too many courses.
【单选题】听力原文：M: I am so relieved, I just finished the story I was working on for our creative writing course. W: I haven't quite finished mine yet. I had trouble getting past the beginning. M: How come? W: We...
A.
Her professor did not like her story.
B.
She had trouble finishing her assignment.
C.
She did not like the topic she had chosen for her paper.
D.
She was taking ten many courses.
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