Finally, the horse was too tired to go any . [ ]
A. far
B. nearer
C. further
D. furthest
答案:C
足太阴睥经的络穴是
A.地机
B.公孙
C.太白
D.大都
E.商丘
如图所示,在外力作用下某质点运动的v-t图象为正弦曲线,从图中可以判断
A.在0~t1时间内,外力做正功
B.在0~t1时间内,外力的功率逐渐增大
C.在t2时刻,外力的功率最大
D.在t1~t2时间内,外力做的总功为零