塞柄结合器顶杆作用是（） 定位。 打开塞柄内旁通。 平衡压力。 打开塞堵。
简要叙述房地产评估市场法的理论依据。
You set the recovery window to seven days and the backup optimization to ON using the CONFIGURE command of Recovery Manager （RMAN）. The most recent backup of the TOOLStablespace to disk was taken on January 3. The TOOLStablespace is read-only.On February 21， when you execute a command to back up all the tablespaces to disk， you find that RMAN backs up the TOOLS tablespace also， even though the contents of the tablespace have not changed after the backup on January 3. Because there are no changes made to the TOOLStablespace， you decide that the tablespace should not be backed up by RMAN. What can you do to skip backing up the TOOLStablespace without changing the current backup optimization setting？（） configure a default device for RMAN backups。 temporarily disable the retention policy for RMAN backups。 configure automatic channel allocation for RMAN backups。 use the CONFIGURE command to reconfigure the recovery window to 60 day。
垂直接地体在地沟内的打入深度应不小于（）m，若地质较硬导致角钢无法打入到要求的深度，可以将角钢的多余部分去除。 1。 1.5。 2.3。 3。
在现埸对油纸绝缘的电力电缆进行耐压试验时，所选择的方法中最适宜的是（）。 交流耐压法。 冲击耐压法。 操作波耐压法。 直流耐压法。
下述关于受体的认识，哪些是正确的（）
