题目

It is said that they'll _________ a hospital here next year to help poor people. A.set up                  B.put up                     C.pick up                  D.look up 答案:A在一次军事演习中,一架飞机沿水平方向一边匀速飞行一边投放军用物资,在此过程中飞机的动能________ (选填“变大”、“变小”或“不变”),物资在加速下落过程中,动能和重力势能之间的转化情况是:________________________。
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