2010版票据改版遵循（）原则。
A、安全性
B、一致性
C、简洁性
D、功能性
参考答案：A, B, C, D
It said the country's confirmed H7N9 cases were isolated and there has been no______ of human-to-human transmission.
A．mark
B．symbol
C．sign
D．signal
三用电路总功率等于各相功率之和。
