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问题 单项选择题

《塔里木油田钻井井控实施细则》规定：高含H2S区域的井、新区第一口探井、高压气井的钻井作业中，从固技术套管后直至完井全过程应配套使用（）。

A.剪切闸板

B.半封闸板

C.全封闸板

D.变径闸板

答案

参考答案：A

单项选择题

下列关于操作系统的主要功能的描述中，不正确的是______。

A．处理器管理

B．设备管理

C．文件管理

D．信息管理
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单项选择题

A local-area network (LAN) is a communications network that (125) a variety of devices and provides a (126) for information exchange among those devices. The scope of the LAN is small typically a single building or a cluster (丛) of buildings. The LAN is usually owned by the same organization that owns the (127) devices. The internal data rate of LAN is at least several Mb/s.
The basic of LAN communication is broadcasting. At each station, there is a transmitter/receiver that communicates over a (128) shared, By other stations. A transmission from any one station is (129) to and received by all other stations.

A．adopted

B．attached

C．selected

D．unified
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