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【判断题】
以太网提供的是无连接的不可靠数据传输服务。____ 原因: 在以太网中,主机发送以太网帧之前不与目的主机之间建立连接并且没有确认机制,若接收方收到出现比特差错的帧会直接丢弃该帧,发送方不会重传出现差错的帧。因此以太网不保证数据最终被接收方正确接收,不提供可靠数据传输服务。A.
正确
B.
错误
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【简答题】离子交换吸附
【单选题】Since chimpanzees are genetically very similar to humans, ______.
A.
chimpanzees are likely to suffer AIDS just like humans if they are infected.
B.
it does not matter if human beings are infected with SIV rather than HIV - 1.
C.
we can use human vaccines to prevent chimpanzees from getting AIDS virus.
D.
AIDS vaccines based on chimp' s immune mechanism are possible to be made.
【单选题】Under what circumstance would chimpanzees collapse the table of other chimpanzees?
A.
Other chimpanzees happened to have more food.
B.
Other chimpanzees wanted to have a fight.
C.
Other chimpanzees took or stole food from them.
D.
Other chimpanzees entered their territory.
【单选题】Which of the following is NOT true of chimpanzees?
A.
Chimpanzees are often comfortable with strangers right away.
B.
Chimpanzees eat meat as well as plants and fruit.
C.
Chimpanzees use tools to help them get food.
D.
Different chimpanzees have different personalities.
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