根据压电效应,在压电材料的任何一个表面的压力均会在相应表面上产生电荷。(X
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中国由于基准用电价格较低,预计在2030年实现光伏上网电价与居民销售电价相当。
A. 正确
B. 错误
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。
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℃=()。