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【单选题】
为了使互联网中的路由器报告出错或者提供有关意外情况的信息,在TCP/IP中设计了一个特殊用途的报文机制( )。A.
ARP
B.
RARP
C.
IGMP
D.
ICMP
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皮皮学刷刷变学霸
举一反三
【单选题】What is a good telephone voice like?
A.
It contains a smile.
B.
It has variety in its expression and tone.
C.
It pronounces words clearly and carefully.
D.
All of the above.
【简答题】基因定位诱变的主要方法有哪几种，它们的原理是什么？
【单选题】From this passage, why is it a good idea for children to learn how to use the telephone?
A.
Children have fun dialing.
B.
Emergencies happen without warning.
C.
Children can wake their parents.
D.
Dialing can help children with their math study.
【单选题】What is a good telephone voice like?
A.
It contains a smile.
B.
It has variety in its expression and tone.
C.
It pronounces words clearly and carefully.
D.
All of the others.
【简答题】基因定位诱变的主要方法有哪几种?它们的原理是什么?
【简答题】I told him that the recital wan for current pupils and because he ________(drop) out he really did not qualify.
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