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【简答题】
在 “探究二力平衡条件”的活动中,主要是通过探究力对物体的作用效果来实现探究目的。如图所示是可供选择的两种探究方案。 ( 1 )甲图中把小车放在较 (选填 “光滑”或“粗糙”)的水平桌面上,对实验结论的得出更有利 ( 2 )甲图中向两吊盘中加砝码,当两盘中的砝码质量 (选填 “相等”或“不相等”)时,小车静止。 ( 3 )如果将两边的砝码放在小车一端的同一个吊盘里,发现小车 (选填 “运动”或“静止”) 。 这表明了小车受到的二力平衡 ,必须要求 ____________ 。 ( 4 ) (选填 “甲”或“乙”)方案的探究过程对实验影响小一些,因为小卡片 的 重力 可以忽略不计,它只受两个拉力的作用
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【简答题】Outside the movie theatre in virtually any American town in the late 1910s stood a life-size cardboard figure of Charlie Chaplin. He was pictured in baggy pants, a cutaway coat and vest, impossibly la...
【简答题】Last night I was driving from Harrisburg to Lewisburg，distance of about eighty miles. It was late. Several times I got stuck behind a slow-moving truck on a narrow road with a solid white line on my l...
【单选题】“只要产品的存储和流通的渠道足够大,需求不旺或销量不佳的产品所共同占据的市场份额可以和那些少数热销产品所占据的市场份额相匹敌甚至更大。”这句话描述的是()理论。
A.
众包理论
B.
长尾理论
C.
零售轮理论
D.
零售组合理论
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A.
Childhood.
B.
Young age.
C.
Middle age.
D.
Old age.
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