粗粒X射线胶片比细粒X射线胶片（）。
A、得到的射线照片清晰度差
B、感光速度慢
C、对比度低
D、需要的曝光时间长
参考答案：A
策划媒介事件
I like . Would you like with me this afternoon? [ ]
A. swimming, swimming
B. swim, to swim
C. swimming, to swim
D. swim, swimming
