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【多选题】
刚体的质心运动定理和牛顿第二定律有何关系?
A.
二者形式一样。
B.
牛顿第二定律是质点的动力学方程，刚体的质心运动定理是刚体平动的动力学方程。
C.
当忽略刚体形状和大小时，质心运动定理就等同于牛顿第二定律。
D.
刚体质心模型就是由此而来。
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举一反三
【单选题】力的法定计量单位是（）。
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千克（kg）；
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达因（dyn）。
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【单选题】Under payment in advance, the importer makes _______ to the supplier before the shipment of goods is done.
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相关题目：
【单选题】力的法定计量单位是（）。
A.
牛顿（N）；
B.
公斤（kg）；
C.
千克（kg）；
D.
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查看完整题目与答案
【单选题】力的法定计量单位是（）。
A.
千克力（kgf）
B.
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【单选题】力的法定计量单位是( )。
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kgf
B.
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【单选题】In 1943, when I was 4, my parents moved from Coeur d’Alene, Idaho, to Fairbanks, Alaska, where adventure was never far away. We arrived in the summer, just in time to enjoy the midnight sun. All that ...
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B.
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C.
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D.
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查看完整题目与答案
【简答题】My name is Damian Costa. I was born in a small village in Italy in 1952. I spent the first few Years of my life there before my family 1 to Perth Australia. We arrived in Australia in the summer of 19...
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【单选题】建造 “地坑院”民居的自然条件是 ( )
A.
土质黏重，不易挖掘
B.
土壤直立性好，不易坍塌
C.
地下水浅，易挖出水
D.
夏季降水多，地坑易蓄水
查看完整题目与答案
【单选题】Under payment in advance, the importer makes ________ to the supplier before the shipment of goods is done.
A.
full payment
B.
partial payment
C.
no payment
D.
most payment
查看完整题目与答案
【单选题】Under payment in advance, the importer makes _______ to the supplier before the shipment of goods is done.
A.
full payment
B.
partial payment
C.
no payment
D.
most payment
查看完整题目与答案