施肥的方法之外施肥法
What is the default value for the ENABLED attribute of a job or program when it is created?() [" TRUE"," FALSE"," There is no default. It must be defined at creation time."," PENDING"," NULL"]
一台变压器原设计的频率为50Hz,现将它接到60Hz的电网上运行,当额定电压不变时,铁芯中的磁通将()。 ["增加","不变","减少","为零不能运行"]
在均匀电场及稍不均匀电场中,设置屏障()提高气体间隙的击穿电压. ["不能","能","能显著"]
You discover an out-of-space condition in the database. You decide to suspend a session for five minutes. You issue the following command to suspend the session: ALTER SESSION ENABLE RESUMABLE; Which command could you issue to enable the resumable space allocation feature at the session level?() [" ALTER SESSION ENABLE RESUMABLE_TIMEOUT = 5;"," ALTER SYSTEM ENABLE RESUMABLE_TIMEOUT = 5;"," ALTER SESSION ENABLE RESUMABLE_TIMEOUT = 300;"," ALTER SYSTEM ENABLE RESUMABLE TIMEOUT = 300;"]
茶馆式教学体现什么理念。