氢气球重10牛,空气对它的浮力为16牛,由于水平风力的作用,.
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氢气球重10N,空气对它的浮力为16N,用绳拴住.由于受水平
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May I speak to your manager Mr. Williams at five o’clock tonight?”
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A,B两地相距320千米,甲、乙两车分别从A,B两地同时相向而行,2小时后相遇.已知甲车的速度是乙车的 7/9 ,甲车每小时行驶多少千米?
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The mother didn't know___________ is to blame for the broken glass as it happened while she was out.
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