多项选择题

The women's volleyball team, now missing its backbone players, age-wise, was rising once again under the leadership of Lang Ping, winning the championships both in( ).

A.the world cup
B.the world championship
C.the Olympic games
D.the National games
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调制信号vf(t)=cos(2π×400t)V对载波vc(t)=4cos(2π×25×106t)V进行角度调制。若最大频偏为△f=15kHz
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给定正交幅度解调器的输入信号为vi(t)=A1(t)cosωit+A2(t)sinωit,本机载波信号分别为v1(t)=cos(ωit+φ)和v1(t)=sin(ωit+φ),求解调输出信号的表示式;如果本机载波信号不正交,分别为v1(t)=cosωit和v1(t)=sin(ωit+β),求解调输出信号的表示式并分析解调结果。
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