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【单选题】
毒性最强的细菌毒素是A.
Ａ.破伤风痉挛毒素
B.
Ｂ.菌肠毒素
C.
Ｃ.白喉外毒素
D.
Ｄ.霍乱肠毒素
E.
Ｅ.肉毒毒素
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【简答题】发送端要发送的数据是1101011011,利用CRC的生成多项式是P(X)=X 4 +X+1,试求 (1)应添加在数据后面的余数是多少? (2)如果数据在传输过程中最后一个1变成了0,问接受端能否发现? (3)如果数据在传输过程中最后两个1都变成了0,问接受端能否发现? (4)采用了CRC检验后,数据链路层的传输是否就变成了可靠的传输?
【单选题】John has really got the job because he showed me the official letter him it.
A.
offered
B.
offering
C.
to offer
D.
to be offered
【简答题】发送端要发送的数据是101110,利用CRC的生成多项式是P(X)=x 3 +1, 试求应添加在数据后面的余数是多少?发送端添加了冗余码后的数据是什么?
【单选题】He showed great interest in my field of work. He asked me______ fresh developments.
A.
to keep him informing
B.
to keep him informed
C.
to be kept informed of
D.
to keep him informed of
【简答题】用award, reward填空。 1. He showed us the athletics _____ he has won. 2. What will you give me in _____ for my help? 3. The _____ for physics and chemistry are _____ by the Royal Swedish Academy of Scienc...
【简答题】He showed me the poems he ___________________ (write).
【判断题】在数据传输系统中的同步，就是指接受速度和发送速度保持一致，也就是接收端要根据发送端所发送信号的频率和起止时间来接收信号，接收端校准自己的接收时间和重复频率，以便和发送端的信号相一致。()
A.
正确
B.
错误
【单选题】He showed great interest in my field of work. He asked me______fresh developments.
A.
informing him of
B.
to inform. him
C.
to keep him informed of
D.
keeping him informed of
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