标准麻花钻最基本的修磨内容是修磨（）。
Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to eliminate the need to qualify the view with the name MARY .EMP_DEP_LOC_VU each time the view is referenced?（） Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command: CREATE PRIVATE SYNONYM EDL_VU FOR mary.EMP DEPT_LOC_VU; then he can prefix the columns with this synonymn.。 Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.。 Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE LOCAL SYNONYM EDL_VU FOR mary.EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.。 Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU ON mary(EMP_DEPT_LOC_VU); then he can prefix the columns with this synonym.。 Scott cannot create a synonym because synonyms can be created only for tables.。 Scott cannot create any synonym for Mary’s view. Mary should create a private ynonym for the view and grant SELECT privilege on that synonym to Scott.。
油气管道系统中的各种仪表是用来测量（）的必要设备。 A、运行参数 。 B、压力 。 C、温度 。 D、流量。
原油储罐油槽中使用的浮标液面仪输出信号传递方式是：（） 电流。 电压。 脉冲。
应用市场法必须具备的前提条件是（）。 需要有一个充分活跃的资产市场。 必须具有与被评估资产相同或相类似的全新资产价格。 可搜集到参照物及其与被评估资产可比较的指标、技术参数。 被评估资产未来收益能以货币衡量。 被估资产所面临的风险也能够衡量。
液化石油气液化的目的是（）。
