W11-4平台所用的主变压器在自然通风冷却方式下额定容量为（）KVA。
A、480
B、680
C、1200
D、1600
参考答案：D
Rebuilding in Yushu began soon alter the earthquake, and it will long into the future. [ ]
A. reach
B. keep
C. stop
D. last
证伪原则
