A:as far as
B:as farther as
C:so far as
D:so farther as
________ toothache, the old man felt very bitter, having no good sleep.
从同一地点同时开始沿同一直线运动的两个物体I、II的速度﹣时间图象如图所示,在0~t2时间内,下列说法中正确的是( )
设函数fx=x-1x6,x<0-x,x≥0,则当x>0时,ffx表达式的展开式中常数项为( )