直流滤波器场有关的刀闸地刀可以在哪些地方操作（）。
A. 运行人员工作站/交直流工作站
B. 继保室SU200装置
C. 继保室6MD66装置
D. 现场就地控制柜
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额定电流为50A的晶闸管可以流过（）A的正弦半波有效值电流。
A. 75
B. 90
C. 100
D. 125
如下哪种方式对于中小企业来讲是开展电子商务的最佳选择？（）
A. 使用第三方平台
B. 单纯邮件营销
C. 自建企业网站
D. 购进专业的myalibaba或ERP系
You have a large amount of historical data in an operating system file. Some analysts in your organization need to query this data. The file is too large to load into your current database. Which is the most effective method to accomplish the task？（）
A. Upgrade the hardware/memory to accommodate the data.
B. Load the data into your database by using the PARALLEL clause.
C. Give analysts DBA privilege， so that they can query DBA_EXTERNAL_TABLE
D. Use an external table so you can have the metadata available in your database， but leave the data in the operating system files.
干空气和水蒸气的混和气体称为湿空气，湿空气中水蒸气的含量很多。
A. 正确
B. 错误
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