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问题 单项选择题

加弹机操作人员在使用DTY小车时，可能导致翻车事故的原因有（）。

A、固定小车的前轮螺母松动

B、小车中间主轮的紧固螺母脱落

C、小车中间轮缠丝严重

D、小车转向轮脱落

答案

参考答案：B

单项选择题

清洁抛光的牙面，牙面上最先形成的是

A．软垢
B．牙菌斑
C．牙石
D．获得性膜
E．色素
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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.

（71）处填（）。

A．handshaking

B．interconnecting

C．linkage

D．joining
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