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【多选题】
电路交换的缺点包括()。A.
电路接续时间长
B.
独占线路导致电路利用率降低
C.
限制了用户自定义终端的直接互通
D.
电路中任何环节的故障都会引起通信中断
E.
存在呼叫损失
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反馈参考答案：
举一反三
【单选题】The population of China ________ 1.3 billion，and 80% of the population________farmers.
A.
are; is
B.
is; is
C.
is; are
D.
are; are
【简答题】What is the population of the city Vancouver? It has a population of ______.
【单选题】Recently, there is ____ boom（繁荣）in population mobility and according to ____ national population survey of 2004, 17 percent of the population move every year.
A.
the; a
B.
a; the
C.
/; a
D.
the;/
【单选题】As the world’s _____ largest city, SH has a population of over ____ million.
A.
6th, 22
B.
8th, 24
C.
10th, 26
D.
12th, 28
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