以恒定功率从静止开始运动的汽车,经时间t后速度达到最大速度vm,在此过程中汽车通过的位移为s,则( )A.s>t B.s=tC.s<t D.条件不足,无法判断 答案:解析:作出汽车以恒定功率由静止开始运动的v-t图象如图所示,则图线与坐标轴围成的“面积”即表示所通过的位移,因△OPt的面积等于,故实际位移s(即曲边三角形OPt的面积)大于.答案:A31、I thought it a pity __________ him
to the tea party.
A. being not
invited
B. not to have invited
C. to not have
invited
D. not to have been invited