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【单选题】
卫星移动通信系统中,抗同频干扰的主要技术措施是( )。A.
控制载波信号的功率谱
B.
控制信号的发射功率
C.
采用正交的地址码
D.
增加接收天线的尺寸
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举一反三
【单选题】If the interest rates decline, one can expect that __________.
A.
prices of the bonds will usually be up
B.
prices of the bonds will usually be down
C.
prices of the bonds will usually remain the same
D.
prices of the bonds may be up or may be down, because the price of bond has no relation with the interest rate
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