利用简化的原理图和图纸来解释系统的操作方法，包括使用过程中的警告装 置和控制特点
A..Making use of simplified schematics and drawings explain how this system operates, including warning devices and control features in use B.Use schematics and drawings as briefly explain the operation of the system, including warning devices and control features in use C.The simplified diagrams and drawings are the indication of the system operation including warning devices and control features in use正确答案A
