中国近代史以鸦片战争为开端,主要依据是 [ ]
A.中国第一次被西方国家打败
B.长期闭关锁国的状况被打破
C.社会性质开始发生根本转变
D.民族矛盾开始成为主要矛盾
答案:C
In the near future, China will increase supply of smaller houses, to help low-income families to buy houses of their own.
A.aims
B.being aimed
C.aiming
D.having aimed
地面通信中常规通信所涉及的通信费用有().
A、LL/CC/AC
B、LC/CC/AC
C、LA/CC/CA
D、LL/CL/AL