October 1, 1949 was the day ________ the People’s Republic of China was founded．

A．which

B．when

C．where

D．in which

供货方供应的袋装水泥，采购方与供货方进行现场交货的数量检验时，应采用( )计算交货数量。

A．查点法
B．理论换算法
C．衡量法
D．经验鉴别法