8V供电系统中，供电系统中，供电回路全程最大允许压降为（）。
A、3V
B、1.8V
C、2.6V
参考答案：A
A: __________?
B: Yes, please. [ ]
A. What would you like?
B. What are you?
C. Would you like some rice?
D. How old are you?
瓦斯防治的检查重点是检查哪些？
