2米波段竞赛频率为()兆赫
A.3.5―3.6
B.144―146
C.400-402
参考答案:B
Beyond, a famous rock band, played its last concert in 2005 and then it officially ______ in Singapore.
A.broke down
B.broke in
C.broke up
D.broke out
华北平原直接与()()()相连。