机车到达站、段分界点停车,签认出段时分,了解()和径路,执行车机联控,按信号显示出段。
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数据库系统是由计算机硬件、数据库、人和软件支持系统组成,其中体现数据之间联系的是()。
A. SQL
B. CPU
C. 数据库
D. 数据库管理系统
DZC系列水力活塞泵随泵式井下参数测试仪,可用于水力泵井下压力、温度及()参数的实时检测。
A. 流量
B. 粘度
C. 气油比
D. 含水率
The Navigation Rules state that a vessel shall be operated at a safe speed at all times so that she can be stopped within().
A. the distance of visibility
B. 1/2 the distance of visibility
C. a distance appropriate to the existing circumstances and conditions
D. the distance that it would require for the propeller to go from full ahead to full aster