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【单选题】
已知调制信号的频率F=1kHz，调频后的【图片】=12，试求：若调制信号频率F由1kHz增大为4kHz，且幅度比原值降低了一倍，调频后的最大频偏和通频带？A.
6kHz 20kHz
B.
6kHz 12kHz
C.
6kHz 14kHz
D.
12kHz 26kHz
E.
12kHz 32kHz
F.
12kHz 24kHz
G.
48kHz 98kHz
H.
48kHz 104kHz
I.
48kHz 96kHz
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A.
so
B.
or
C.
though
D.
since
【单选题】I had no idea of the exact address of Xinhua High School ________I was outside its front gate.
A.
when
B.
after
C.
until
D.
because
【简答题】I had the windows cleaned yesterday.(翻译)
【单选题】Not once since my son went to high school ______ traveling with him.
A.
had I gone
B.
have I gone
C.
I have gone
D.
I had gone
【单选题】I had never heard an English word ________ before I went to junior high school. [ ]
A.
speak
B.
to speak
C.
speaking
D.
spoken
【单选题】The doctor insisted I ____ a high fever and that I ____ a rest for a few days. [ ]
A.
had; had
B.
have; have
C.
had; have
D.
have; had
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