题目内容

Undergraduates in institues of higher learning take basic courses and _. In adddition, a wide range of extracurricula activities and associations help them practise,,and ___, preparing them for society.

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__________________________is highly valued as it helps to relieve teh the critical shortage of qualified technicians and skilled workers.

平面内三个共点力的大小分别为3N,6N,9N,它们的合力的最大值和最小值分别为( )

A. 24N和3N
B. 18N和0
C. 6N和6N
D. 12N和9N

如果两个力的大小相等,则它们在同一坐标轴上的投影相等。

A. 一定
B. 不一定
C. 一定不

作用于同一点的两个力,其大小分别为6N和4N,通过分析可知,无论两个力的方向如何,它们的合力大小都不可能是。

A. 1N
B. 10N
C. 2N
D. 8