—Don't forget _______ the lights. We should help save electricity.
A:turning off
B:to turn off
C:not to turn off
D:not turning off
乐乐家有款电热水器,说明书上有工作原理电路图(如图甲),有“加热”和“保温”两档.正常工作时电路的总功率分别为1100W和11W.试求: