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【单选题】
下列说法关于ADC0809说法正确的是（）。A.
ADC0809 对被测信号的大小和频率无要求。
B.
ADC0809 可以测量 0-5v 间变化的任何单极性信号。
C.
ADC0809 对被测信号只有频率要求。
D.
ADC0809 对于频率太高的信号需要在输入前增加采样保持电路。
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举一反三
【单选题】Female soldiers cried ______they left their drill camps on the outskirts of Beijing on October 5, 2009.
A.
while
B.
before
C.
until
D.
as
【单选题】Has John ____ Beijing _____ Shanghai?
A.
leaving; to
B.
left; to
C.
left; for
D.
leaving for
【简答题】B:Nothing special.
【单选题】Was it on that morning _____ you left for Beijing _____ he discovered our secret? [ ]
A.
that; where
B.
which; that
C.
when; that
D.
that; when
【单选题】He ___ Beijing for a long time.
A.
has been away
B.
has left
C.
has been away from
D.
left
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