对于采用光电式曲轴位置传感器信号作为触发信号的点火系统而言，当发动机无法起动时，以下哪个原因可能引起此现象？（） ["发光二极管（LED）烧坏","点火线圈短路","发动机控制模块有故障","以上原因都可引起此现象"]
在安装夹板阀前，应检查（） ["内旁","阀面有无划痕","阀芯密封有无损坏","A、B、C组合"]
清算假设是对资产在非公开市场条件下被迫出售或快速变现条件的假定说明。
什么是电压？
You installed Oracle Database 11g afresh. Which statements are true regarding the default audit settings in this database？（） [" The audit trail is stored in an operating system file."," Auditing is disabled for all privileges."," The audit trail is stored in the database."," Auditing is enabled for all privileges."," Auditing is enabled for certain privileges related to database security."]
简述植物病害的隐症。
