A:葡萄糖和蔗糖
B:蔗糖和麦芽糖
C:甲酸甲酯(HCOOCH3)和乙酸(CH3COOH)
D:淀粉和纤维素
(1)如图1所示,物体A的长度是 ____ cm.
(2)如图2所示,温度计的示数是 ____ ℃.
I want to go shopping ______ some new clothes for my cousin.
如图,△ABC中,AC=3,BC=4,∠ACB=90°,E、F分别为AC、AB的中点,过E、F两点作⊙O,延长AC交⊙O于D.若∠CDO=12∠B,则⊙O的半径为( )
— Sorry, I didn't pass the exam, and then what should I do?
—I think perhaps you should be careful next time.
如图2所示电路中,L是电阻不计的电感器,C是电容器,闭合电键S,待电路达到稳定状态后,再断开开关S,电路中将产生电磁振荡.如果规定电感器L中的电流方向从A到B为正,断开开关的时刻t=0,那么图中能正确表示电感线圈中电流i随时间t变化规律的是( )