用滚杆运输设备，滚杆的数量和间距应该根据设备的（）来决定。
A、重心
B、重量
C、结构
D、材料
参考答案：B
Film has a much shorter history, especially when ________ such art forms as music and painting. [ ]
A. having compared to
B. comparing to
C. compare to
D. compared to
中 * * * * 胡 * * 代表十七届中央委员会向中共第十八次代表大会报告的题目是什么？
