评价酸化压裂效果时，井温曲线异常明显说明作业效果（）。
A.无
B.差
C.一般
D.好
参考答案：D
They’re ________ choosing a cautious policy in order to avoid a risk in such an important event. [ ]
A. thoroughly
B. deliberately
C. carelessly
D. naturally
低压高阻接地系统发生单相接地故障时应如何处理？
