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【单选题】
●数据链路层在物理层提供比特流传输服务的基础上，在通信的实体之间建立数据链路连接，传送的数据单元是 (30) 。 (30)A.
比特bit
B.
帧frame
C.
分组packet
D.
报文message
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反馈参考答案：
举一反三
【单选题】My uncle lives in Shanghai. My father ______ him when he went to Shanghai on business. [ ]
A.
dropped off
B.
dropped into
C.
dropped by
D.
went past
【单选题】I went there yesterday to see my uncle .
A.
special
B.
especially
C.
specially
D.
especial
【单选题】— Where were you yesterday? — ____________ [ ]
A.
You went to see a film.
B.
I went to my uncle's farm.
C.
Because I was tired.
【单选题】_______ meet my uncle at the station, I went there by taxi instead of by bus.
A.
In order to
B.
In order that
C.
So as to
D.
So that
【简答题】.第一个观察到植物死细胞的人是英国学者___________,第一个观察到活细胞的人是荷兰学者__________。
【单选题】I went there yesterday_________to see my uncle.
A.
special
B.
especially
C.
specially
D.
Especial
【简答题】将SRAM 中存储的 CNC 参数和加工程序等存入存储卡。
【单选题】My uncle went to the police station to ______ the lost watch.
A.
inquire
B.
claim
C.
demand
D.
require
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