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【简答题】
信号传输中差错是同（）所引起的。噪声有两大类，一类是信道所固有的，持续存在的随机热噪声；另一类是由外界特定的短暂原因所造成的冲击噪声。热噪声引起的差错称为（）。
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皮皮学刷刷变学霸
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【简答题】微型计算机存储系统中，PROM是
【单选题】—I wonder ________ so many people are crazy about Gangnam Style. —It's good for bodybuilding, and it brings people a lot of fun, you know.
A.
how
B.
where
C.
why
D.
that
【简答题】13. Cotton_____ in
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【单选题】It has been five years since the party _____. Many people wonder whether it will stay on. [ ]
A.
has come to power
B.
came to power
C.
has been in power
D.
in power
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