电子商务系统的物理模型又称为( )。
A．概念模型
B．数学模型
C．技术模型
D．逻辑模型
参考答案：C
为制作高度为2m的英雄塑像，先用同样材料制作一个小样，高度为20cm，质量为3kg，那么这个塑像的实际质量将是 [ ]
A． 3kg
B． 30kg
C． 300kg
D． 3t
Further reading made me realize that it was hard work and determination as well as her good nature _____ had got her into medical school.
A．when
B．which
C．how
D．that
