若a>0, b>0, 且函数f(x)=4x3-ax2-2bx+2在x=1处有极值,则ab的最大值等于
9
He arrived here at noon, ﹍﹍in the day, and he went out and came back﹍﹍in the day.
A.late; late
B.late; later
C.later; late
D.later; later
同一车内装载的军用危险货物,必须符合军用危险货物铁路运输配装规定,()的货物同车配装,车辆编组隔离和停止制动作用按照要求高的办理。