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【判断题】
由于IP协议提供的是不可靠服务，所以需要在数据链路层加入流量控制和差错控制技术。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】They are building a new supermarket in this district. (passive voice)
【简答题】They are building a new park in our city.
【简答题】They are building a hotel near the station.
【单选题】---What are the workers doing over there? ---They are building a ________ ship.
A.
ten-thousands-ton
B.
ten-thousand-tons
C.
ten-thousand-ton
D.
ten-thousands-tons
【单选题】They are building a new bridge ______ the river .
A.
across
B.
over
C.
through
D.
pass
【单选题】They are building a dam in ______ with another firm.
A.
comparison
B.
association
C.
touch
D.
tune
参考解析：
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