()是指利用同一个SYM-N中相邻的VC-4级联成VC-4-Xc,以此作为一个整体信息结构进行传输。
A.复用
B.相邻级联
C.虚级联
D.放大级联
参考答案:B
一个口袋中装有4个红球和6个白球,这些球除颜色外完全相同,一次从中摸出4个球,至少摸到2个红球的概率为______.
The prices of houses, ____________ is often reported, have been going up sharply in the past few months.
A.which
B.it
C.as
D.what