搜题请搜索小程序“爱下问搜题”
问题
多项选择题
下面属于双极性编码的是()
A.HDB3
B.B8ZS
C.AMI
D.NRZ
答案
参考答案:
A, B, C
选择题
在△ABC中,a,b,c分别是角A,B,C的对边,且(2a-c)cosB-bcosC=0,a=10,C=30°,则c=( )
A.3
B.5
C.
5
3
D.
10
3
查看答案
选择题
The A(H1N1) influenza (甲流)was spreading rapidly across the country but it remained under______ control, _______official with the Ministry of Health said in Beijing on Sunday.
A.不填;an B.the; an C.不填;不填 D.the; the
查看答案