什么是谐振过电压？
参考答案：
由于电感电容等参数在特殊情况下发生谐振而引起的过电压称做谐振过电压。
引起血脂异常的原因是什么？
In each production lot for a certain toy, 25 percent of the toys are red and 75 percent of the toys are blue. Half the toys are size A and half are size B．If 10 out of a lot of 100 toys are red and size A, how many of the toys are blue and size B ？（）
A.15
B.25
C.30
D.35
E.40
