How much for one melon?[ ]
A. It's 5 yuan.
B. It's expensive.
C. It's 5.
答案：A
根据实际情况回答问题。
1. Do you have a camera?
_________________________________________________________
2. Are cameras easy or hard for you?
对于Y。/Y。/△接线的自耦变压器，零序差动保护取用的零序电流是高压侧零序电流，中压侧零序电流和接地中性线中的零序电流
