影视广告按照媒体播放内容分包括()
A、现场播出广告
B、商品广告
C、公益广告
D、企业形象广告
参考答案:B, C, D
— What did Mike do?
— _________________[ ]
A. He did his homework.
B. She did her housework.
C. He goes to school.
在光线条件比较差的实验室内使用显微镜时,应该( )
A.调大光圈,
B.用平面反光镜
C.使用高倍镜
D.调节细准焦螺旋