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【判断题】
当运输层采用面向连接的 TCP 协议时,逻辑通信信道是一条全双工的可靠信道;当运输层采用无连接的 UDP 协议时,逻辑通信信道是一条不可靠信道。( )A.
正确
B.
错误
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举一反三
【单选题】Awoman has ,to be______a man to go half as far.
A.
twice as good as
B.
as twice good as
C.
twice good as
D.
twice so good as
【单选题】The little town has now grown into a modern big city, and is _____ what it used to be. [ ]
A.
twice the size than
B.
two times the size as
C.
twice the size as
D.
twice the size of
【简答题】He has seen that film twice ______
【单选题】Object 1 has twice the mass of Object 2. Both objects have the same kinetic energy. Which of the following statements is true?
A.
Both objects can have the same magnitude of momentum.
B.
Object 1 has a momentum of greater magnitude than Object 2.
C.
The magnitude of the momentum of Object 2 is four times that of Object 1.
D.
All the statements are false.
E.
All the statements are true.
【单选题】Object 1 has twice the mass of Object 2. Each of the objects has the same magnitude of momentum. Which of the following statements is true?
A.
Both objects can have the same kinetic energy.
B.
One object has 0.707 times the kinetic energy of the other.
C.
One object has twice the kinetic energy of the other.
D.
One object has 4 times the kinetic energy of the other.
E.
None of the others.
【单选题】The production of the factory has grown to _____ in 1999.
A.
twice as it was
B.
twice what it was
C.
as twice as it was
D.
twice that it was
【单选题】— Has the little girl passed ______ P.E．test? — She has tried twice, and the teacher will allow her to have _____ third try.
A.
the; 不填
B.
a; the
C.
the; a
D.
the; the
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