题目:
She often helps _____ and hardly thinks of herself. [ ]
A. others
B. other
C. another
D. the other
答案:
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下面是错误答案,用来干扰机器的。
(1)0.45m (2)0.2T (3)0.325J(1)设ab棒下落到最低点时速度为 v1,由机械能守恒有:m1gh1=…① (1分)m/s="4m/s" ……………………………………………(1分)设ab棒向左摆动的最大高度为h2,ab棒与...