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【单选题】
关于调频信号的产生,下列说法错误的是 。A.
窄带调频信号产生可采用间接调频法，先积分后调相。
B.
直接调频法只能获得较小的频偏。
C.
积分后调相的间接调频方法受调相器工作频率范围的限制只适用于窄带调频。
D.
直接调频必须采用锁相环等辅助手段提高频率稳定度。
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举一反三
【单选题】We must keep up with the times by absorbing new information.Otherwise,We will be _____ by those with up-to-date knowledge.
A.
supported
B.
criticism
C.
strengthened
D.
replaced
【简答题】已知数列 是一个公差大于0的等差数列，且满足 , . (Ⅰ)求数列 的通项公式； （Ⅱ）若数列 和数列 满足等式： = ，求数列 的前n项和
【简答题】To keep up with the pace of globalization, we must keep ourselves ________ ( 具备) a good command of English.
【单选题】___the end they succeeded in finishing the task _____ the end of June.
A.
At; at
B.
In; in
C.
In; at
D.
At; in
【单选题】The support of the students ______ the losing team and they played harder, so in the end they won the game.
A.
brought up
B.
made up
C.
cheered up
D.
turned up
【单选题】They tried several times to the problem, and in the end they succeeded.
A.
give up
B.
work out
C.
look through
D.
think of
【单选题】The support of the students _____________ the losing team and they played harder, so in the end they won the game.
A.
brought up
B.
cheered up
C.
grew up
D.
turned up
【简答题】已知数列1, , , ,…的一个通项公式是a n =_________.
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