就高炉内料柱总体来说，炉料下降的条件是什么？
参考答案：
一是炉料的重力必须超过其运动中所遇到的阻力；二是炉料下部可连续提供空间。
People prefer ______ TV or listen to music rather than ______ newspapers to relax themselves. [ ]
A. watching; read
B. watching; to read
C. to watch; read
D. to watch; reading
具有报关权的企业也具有进出口经营权。( )
