用笔画线代替导线,将图中两灯分别按要求组成电路。开关控制整个电路。
组成串联电路 组成并联电路
In order to get good marks, he has changed his attitude ______ study.
A.about
B.of
C.to
D.on
MP3来自下列哪个音频压缩国际标准()
A、MPEG
B、AVI
C、H.265
D、JPEG