在电流保护中防止反向短路误动作的方案可以是()。
A.装设功率方向继电器
B.采用不完全星形接线
C.装设方向阻抗继电器
D.比较保护之间的动作时限或整定值
参考答案:A, D
Which of the following is the most accurate definition of the velocity of money The velocity of money is the:()
A. GDP of a country divided by its price level.
B. money supply of a country divided by its price level.
C. GDP of a country divided by its money supply.
钻井过程中,发现溢流的显示()。
A、泥浆池液面升高
B、钻速减慢
C、泵压上升