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问题 单项选择题

技师甲说，故障查找是查找并认证故障原因的诊断过程，技师乙说，故障查找是利用因果关系一步步排除故障的过程。谁正确？（）

A.甲正确

B.乙正确

C.两人均正确

D.两人均不正确

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.

（73）处填（）。

A．dependent

B．conformable

C．consistent

D．associated
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判断题

国家利益是决定国家关系的主要因素。（）
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