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【单选题】
IPv4中所规定的IP地址长度为( )。A.
32
B.
38
C.
64
D.
128
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举一反三
【简答题】You were at rest and a police car with its siren on was passing you with a constant speed. You found that the frequencies of the siren were respectively 550 Hzand 450 Hzwhen the police car was moving ...
【单选题】.-Did you attend the opening ceremony of The Voice of China last week? Sorry We ____it , but we had a terrible trafffic accident on our way.
A.
must have attended
B.
must attend
C.
could have attended
D.
could attended
【单选题】-Did you attend the opening ceremony of The Voice of China last week? -Sorry! We ▲ it, but we had a terrible traffic accident on our way.
A.
must have attended
B.
must attend
C.
could have attended
D.
could attended
【单选题】When we are cheerful, we talk faster, and the pitch of our voice rises.
A.
the degree of highness or lowness of a tone
B.
height, degree, or intensity
C.
the steepness of a slope, especially of a roof
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