中国古代都城的居住区划分单位在汉朝称(),在唐朝称()。
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You are connected to Recovery Manager (RMAN) without a recovery catalog. There is no copy of the control file available. You want to restore the control file from an autobackup. To retrieve the autobackup,you need the database ID (DBID). In which two sources would you find the DBID? ()
A. the trace file
B. the alert log file
C. an RMAN session log file
D. the server parameter file
E. the formatted name of a control file autobacku
色饱和度又称(),是指彩色光所呈现出来的彩色的深浅程度。
A. 亮度
B. 色浓度
C. 灰度
D. 浓度
高压验电器可用于低压验电,而低压验电器不能用于高压验电。
A. 正确
B. 错误