磁滞损失和（）损失的总和为铁损。
参考答案：涡流
When the fans hurried to the airport, they found that the famous singer _____.
A．had left
B．has left
C．left
D．will leave
巴黎系统标称剂量率是基准剂量率的（）
A.95%
B.90%
C.85%
D.80%
E.75%
