母线上构成复杂环形网络的二线路，切除一回线后另一回线的零序阻抗一定变大
参考答案：错
解析：
知识点：基础知识
With your help, there is no doubt ______ our plan is meant for will work out successfully. [ ]
A. that what
B. whether that
C. what that
D. that whether
用来制造机器零件的设备统称为( )。
A．加工工具
B．工具
C．金属切削机床
D．毛坯
