当变压器空载时，空载电流很小，绕组的铜损（）。
A、也很小
B、很大
C、无穷大
D、为零
参考答案：A
Stanford University was founded by Leland Stanford in 1884, _______________ his son who had died before.
A．in spite of
B．in case of
C．in memory of
D．in search of
下列特征中不是面向对象方法的主要特征的是( )。
A．多态性
B．继承
C．封装性
D．模块化
