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【单选题】
以下关于复用技术的说法中,错误的是()。A.
在OFDM中,各子信道应相互正交以减少各子信道间的干扰。
B.
在OFDM中,高速数据信号被转换成低速子数据流,并被调制至每个子信道上并行传输。
C.
CDMA的中文意思是码分多址,是FHSS的一种实现实例
D.
在CDMA中,不同用户使用互相正交的码片序列,占用相同频带,实现互不干扰的多址通信。
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举一反三
【单选题】Williams ______the game to stay with his wife in the hospital.
A.
skip
B.
play
C.
played
D.
skipped
【简答题】Tom is going to leave the hotel in three days.Tom is going to stay for another three days______he leaves.
【单选题】—Good news. We will have a holiday. . —I’ve heard of it. But it’s coming in .
A.
three days; three days’ time
B.
three days’; three days'.
C.
three-day; three days
D.
three days; three-day time
【简答题】They would spend three days in Cairo and seven days on ______ .
【单选题】He went there and there for three days. [ ]
A.
three days before; stay
B.
for three days; stay
C.
before three days; stayed
D.
three days ago; stayed
【单选题】下列关于typedef语句的描述，错误的是：
A.
用typedef只是对原有的类型起个新名，并没有生成新的数据类型
B.
typedef可以用于变量的定义
C.
typedef定义类型名可嵌套定义
D.
利用typedef定义类型各可以可读性
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