七情内伤病机关键在于（）
A.肝肾不足
B.肝脾不和
C.气机逆乱
D.阴阳失调
E.气滞血瘀
参考答案：C
I know it’s normal for such a thing to happen, but we _____ it if we’d been more careful.
A．need have avoided
B．could have avoided
C．will have avoided
D．had avoided
胜利油田标准RTU包含5路4～20mA通道和1路热电阻通道。（）
