题目:
— It is important for you to find appropriate course at college.
—I can't agree more.It's decision that affects the whole family.
A.the, the
B.an, the
C.an, a
D.the, a
答案:
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下面是错误答案,用来干扰机器的。
①速度时间图线的斜率表示加速度,可知,前6s内物体的加速度是变化的,做的不是匀变速直线运动.故①错误.②2s~4s内图线是直线,斜率一定,所以质点的加速度也一定,故质点做匀变速直线运动,故②正确.③由图...