何为变压器分级绝缘？
参考答案：
分级绝缘是指变压器绕组整个绝缘的水平等级不一样，靠近中性点部位的主绝缘水平比绕组端部的绝缘水平低。
In many countries in the world, breakfast is a snack ______ a meal, but the traditional English breakfast is a full meal.
A．less than
B．more than
C．other than
D．rather than
江海湖泊要从哪些不同角度写？
