按制图中组合体的形体特征可分为哪三类？
参考答案：
按制图中组合体的形体特征可分为切割类、叠加类、综合类三类。
__ it was hard for children to leave family and friends, many families chose to send their children
to America. [ ]
A. Because
B. Although
C. If
D. As
英国广告管理的机构组成和英国广告管理的方式方法
