设A矩阵,B矩阵则AB=___
与从价税相比,从量税()
______our catalogues for your reference.
根据《销售合同公约》的规定,若是合同中未规定具体的交货时间,原则上讲,买方无权要求即时交货。()
____shipment, please amend the L/C to allow transshipment.
设随机变量X的分布函数为F(x),已知F(2)=0.5,F(-3)=0.1,则P{-3<X≤2} = _________.