数字量输入/输出插件的功能是什么？
参考答案：
机车工况110V电压信号输入，放风、卸载等控制指令对外继电器输出。
Steven has a lot of work to ______ in the office since he has been away for quite a few days.
A．take up
B．make up
C．work out
D．carry out
生理学所说的体温是指人体皮肤表面的平均温度。（）
