路堤是指全部用岩石或土填筑而成的路基,路床以下的路堤分上、下两层,路面底面以下()范围的填土部分为上路堤,上路堤以下的填方部分为下路堤。
A. 30-150cm
B. 80-150cm
C. 30-80cm
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ou are managing an Oracle Database 11g database. You want to take the backup of MULT_DATA, a big file tablespace of size 100 TB on tape drive, but you have tapedrives of only 10 GB each. Which method would accomplish the task quickly and efficiently?()
A. parallel image copy backup
B. backup with MAXPIECESIZE configured for the channel
C. parallel backup with MAXPIECESIZE configured for the channel
D. intrafile parallel backu
一般认为土壤盐基饱和度为()土壤肥力比较低下
A. ≥80%
B. 50%---80%
C. <50%