Which of the following is true according to the text?
A．Elevators are silent places.
B．Billboards are the last mass medium.
C．It is impossible to predict mega audiences.
D．Some prognosticators seem pretty naive.

未分类题在JPEG中使用了哪两种熵编码方法( )。A.统计编码和算术编码 B.PCM编码和DPCM编码 C.预测编码和变换编码 D.哈夫曼编码和自适应二进制算术编码

未分类题American consumers are losing interest in tech products because______.A．the products are too difficult to useB．the companies don't listen to consumer complaintsC．US-made electronics are unreliableD．consumers are losing faith in products that don't do what they want them to do

未分类题In paragraph 1, the author cites the examples in order to demonstrate that______.A．gadgets do not function as we would likeB．gadgets work, but we do not use them properlyC．gadgets are smaller and cost lessD．people need clear instructions on how to use new gadgets

未分类题'Dusting upstarts in a cutthroat arena' in paragraph 3 means______.A．matching your competitors in the marketplaceB．introducing new features in gadgets that are on the marketC．defeating competitors in a competitive marketD．competing effectively with companies that introduce new, unnecessary features

未分类题脱产培训相对于在职培训来说()