如图所示，属于交变电流的是( )
CD
本题考查的是对交变电流的理解，交变电流是大小和方向都随时间周期性变化的电流，CD正确；
---So you were in the supermarket __________ you heard a strange sound, right?
---That’s true. I ran out as quickly as possible.
A．when
B．while
C．then
D．which
自行到市内非定点医疗机构就医的，危及生命体征须就近抢救的情况可以进行现金报销.
