A:①④
B:②③
C:②④
D:③④
全国各地公安交警查禁酒后驾驶的等违法行为,此项查禁( )
用如图所示电路探究“电功率与电流的关系”,以下观点不正确的是( )
— How many books did you borrow in the library?
— Three. I borrowed one yesterday and ________ two this morning.