The engine fuel control system has many interfaces with airplane components and systems. Most of the interfaces are digital, but some are analog. The above sentence means"发动机燃油控制系统有很多接口连接到飞机部件和系统。大部分信号是模拟的，但一些是数字的。"
A.1正确答案B
The engine fuel control system has many interfaces with airplane components and systems. Most of the interfaces are digital, but some are analog. The above sentence means"发动机燃油控制系统有很多接口连接到飞机部件和系统。大部分信号是模拟的，但一些是数字的。"
A.1正确答案B
