井下供移动变电站的高压馈电线上,必须装设有选择性的动作于跳闸的单相接地保护装置。()
参考答案:对
I have ever lived in New York and London, ______________I don't like either city.
A.so
B.though
C.because
D.but
录井仪器自动化程度高是准确记录钻时的基础。