试题与答案

面罩上的护目玻璃起到减弱电弧光并过滤()。A、红外线B、紫外线C、X射线

题型:单项选择题

题目:

面罩上的护目玻璃起到减弱电弧光并过滤()。

A、红外线

B、紫外线

C、X射线

答案:

参考答案:A

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题型:完形填空
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“Mom, where's Dad?” I asked, “He's working in the  ____  on the side of the house!” she answered.
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题型: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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