简述幼儿园管理的基本原则。
双曲线齿轮的驱动桥必须选用双曲线齿轮油。
物流EDI系统的主要功能是提供报文转换。不同类型的企业,对报文的要求的一样。
Which three statements are true about the privileged connection options available in Oracle9i?() ["The CONNECT INTERNAL is disallowed. ","The Server Manager tool is no longer supplied. ","The listener must be running to make a connection. ","The use of remote password login file (orapw<sid>) is unchanged."]
润滑脂同润滑油的作用类似,但是润滑脂不具有冷却作用。
柴油的闪点