市场上常见的DVD-RW可刻录光盘,其最大存储容量为( )。
A.4.7MB
B.47MB
C.470MB
D.4700MB
参考答案:D
This series of products ______ in special price for a month to promote its sales from next month.
A.are
B.is
C.has been
D.is to be
如果代数式2x2+3x+7的值为8,则4x2+6x﹣9的值是[ ]
A.7
B.﹣7
C.17
D.﹣17