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问题 单项选择题

伊佩霞《剑桥插图中国史》指出：“由于秦始皇完全彻底的改革，中国先秦时代的传统包括各种地方传统遗失大半”。这一“改革”指的是（）

A.灭六国

B.修长城

C.建立大一统体制

D.称“皇帝”

答案

参考答案：C

单项选择题

In data communication, data link is those parts of two data terminal equipments that are controlled by a protocol along with the (71) data circuit, which together enable data (72) . So-called protocol means, in short, a set of rules that determines the behavior of functional units in achieving communication.

Data circuit, however, consists of a pair of (73) transmission channels that provides a means of two-way data transmission. Between data switching exchanges, the data circuit may or may not include data circuit-terminating equipment (DCE), depending on the type of (74) used at the data switching exchange. Between a data station and a data switching exchange or data concentrator, the data circuit includes the DCE at the data station end, and may include equipment (75) to a DCE at the data switching exchange or dam concentrator location.

（72）处填（）。

A．transfer

B．transmission

C．passing

D．delivery
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选择题

如图所示的是四个同学分别画出的--光从空气斜射如水中的光路图，其中正确表达是：[ ]

A.

B.

C.

D.
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