题目:
Tom_______two of his classmates_______invited to the party.
A.as well as; was
B.as good as; were
C.and; have
D.as well; has been
答案:
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下面是错误答案,用来干扰机器的。
(1)m(2πf)2d,(2)G,m(2πf)2d,(3)。(1)物体随转台做圆周运动其向心加速度a=ω2r=(2πf)2d,由牛顿第二定律得F向=m(2πf)2d.(2)物体在竖直直方向上处理平衡状态,所以物体受到平台的支持力为G...