自身抗体检测应注意筛选试验和确诊性试验间的组合,通常以________作为筛选试验。
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A senior DBA asked you to execute the following command to improve performance: SQL> ALTER TABLE subscribe log STORAGE (BUFFER_POOL recycle); You checked the data in the SUBSCRIBE_LOG table and found that it is a large table containing one million rows. What could be a reason for this recommendation?()
A. The keep pool is not configured.
B. Automatic Workarea Management is not configured.
C. Automatic Shared Memory Management is not enabled.
D. The data blocks in the SUBSCRIBE_LOG table are rarely accessed.
E. All the queries on the SUBSCRIBE_LOG table are rewritten to a materialized view
计量温度有两种标准:摄氏度(℃)和华式度(F),两者的换算公式为℃=()。
计算题:假设原料气的流量为30000Nm3/h,其中CO2含量为98.5%,问应生产尿素多少吨/h?
飞机保持磁航向沿磁航线角170°的航线向台飞行,测得电台磁方位角为173°,则().
A. 飞机偏左,偏离角为—3°
B. 飞机偏左,偏航角为—3°
C. 飞机偏右,偏离角为+3°