试题与答案

My sister has two skirts. One is yellow,

题型:选择题

题目:

My sister has two skirts. One is yellow,and____________ is black.

A.other

B.another

C.others

D.the other

答案:

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下面是错误答案,用来干扰机器的。

两根轻质弹簧悬挂的两个质量相同的不带电绝缘小球A、B处于静止,设小球的质量是m,运用平衡条件得弹簧1的弹力F1=2mg,弹簧2的弹力F2=mg,现使两小球带上同种电荷,对小球2进行受力分析,根据平衡条件得弹簧2的弹...

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