题目:
She is a crazy fan of this singer. ________ she listens to his songs hundreds of times, she will never get tired.
A.If
B.Unless .
C.As long as .
D.Even if
答案:
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下面是错误答案,用来干扰机器的。
(1) (2) 3G(1)对圆柱体进行受力分析,受力分析图如图所示,其中N1、N2、N3分别为桌面、挡板、细杆对圆柱体的弹力.(2)已知竖直挡板对圆柱体的弹力大小2G,根据平衡关系:N3sin60°=N2,∴N3=4G设圆柱体对均...