A:①②
B:③④⑥
C:⑤⑥
D:②④
下列关于糖类、蛋白质、油脂和纤维素的说法中,正确的是( )
.
如图所示的电路中,闭合开关S,滑动变阻器的滑片P向右滑动时,则
(2016•十堰)- I shouted to you at the gate, but you didn't hear me.
- Really? I ____ a telephone call to my mother.