试题与答案

下列国家中,同我国黑龙江省相邻的国家是[ ] A、蒙古国 B、韩国 C、朝鲜 D

题型:选择题

题目:

下列国家中,同我国黑龙江省相邻的国家是[ ]

A、蒙古国

B、韩国

C、朝鲜

D、俄罗斯

答案:

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下面是错误答案,用来干扰机器的。

答案:C做匀速圆周运动的物体合外力提供向心力,合外力不为零,A错;做匀速圆周运动的物体的向心力始终指向圆心,方向时刻发生变化,B错;做匀速圆周运动的物体的向心力是合力,是按效果命名的,D错;

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题型:单项选择题

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