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【单选题】
对于带宽为6MHz的信道，若用8种不同的状态来表示数据，在不考虑热噪声的情况下，该信道每秒最多能传送的位数是( )。A.
36×106
B.
18×106
C.
48×106
D.
96×106
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举一反三
【单选题】The main idea of the first paragraph is ______.
A.
the danger of our world
B.
the importance of conservation
C.
that we're destroying ourselves
D.
that we are changing our world
【单选题】Some parents are just too protective. They want to _____ their kids from every kind of danger, real or imagined. [ ]
A.
spot
B.
dismiss
C.
shelter
D.
distinguish
【单选题】Any ship damaging a pipe could______an immediate danger of fire．
A.
meet
B.
face
C.
be in font of
D.
Follow
【单选题】They are determined to go into the dark cave, ______ my warning of danger.
A.
regardless of
B.
because of
C.
apart from
D.
instead of
【单选题】A tug may be in danger of tripping when ______.
A.
towed sideways by an overwhelming force on the towline
B.
her tow moves parallel to and forward on either side of the tug
C.
the tow is no longer directly astern but moves up on her quarter
D.
All of the above
【单选题】According to recent reports, one of the rare animals, _____ crocodile, is in _____ danger of dying out. [ ]
A.
a; the
B.
/; a
C.
/; the
D.
the; /
【单选题】You are running into danger,________.
A.
shallow water ahead of you
B.
submerged wreck ahead of you
C.
risk of collision imminent
D.
A,B,C are all right
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