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【简答题】
一沿x轴正方向的力作用在一个质量为3.0Kg的质点上。已知质点的运动学方程为x=3t-4t2+t3,则最初的4.0s内对物体所做的功为(_ _)焦耳,在t=1s时,力的瞬时功率为(_ _)瓦特。
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A.
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【多选题】中位机能是( )型的换向阀在中位时可实现系统卸荷。
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【简答题】Translate the last two sentences in para 4: 作为一个 1 ,惠特曼开始 2 ,将 3 。在这之前,没有人曾 4 。
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Urban fires
B.
American fire fighting innovations.
C.
The history of fire.
D.
The Great San Francisco Fire.
查看完整题目与答案
【多选题】中位机能是( )型的换向阀在中位时可实现系统卸荷。
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