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问题 解答题

一批零件分给甲、乙、丙三人完成，甲完成了总任务的30%，其余的由乙、丙按3：4来做，丙共做了200个，问这批零件共有多少个？

答案

乙和丙做的总数：200÷（

4
3+4
）=350（个）

这批零件总数是：3500÷（1-30%）=500（个）

答：这批零件共有500个．

单项选择题

The data station usually means a (71) unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72) control functions.

In (73) data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74) by the primary station, interprets received commands and (75) responses to be transmitted.

（75）处填（）。

A．produces

B．creates

C．generates

D．makes
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名词解释

膝关节的终末旋转
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