L90保护装置运行参数测量功能有哪些？
参考答案：
L90保护装置运行参数测量功能有本侧线路电流、电压、有功、无功、功率因素、频率、差流、对侧电流等。
Sugar is sold by _______ pound, petrol by _______ gallon.
A．a; a
B．a; the
C．the; a
D．the; the
I had hoped Mr.Blake ___ earlier than usual.
A．came
B．to come
C．would come
D．was coming
