两只定值电阻,甲标有“10Ω 1.5A”,乙标有“20Ω 1A”,把它们串联起来,电路两端允许加的最大电压为____ V;把它们并联起来,干路中允许通过的最大电流为____ A。
— What's up, Dave?— The meeting is almost over, but Henry hasn't yet.
把一张矩形纸片(矩形ABCD)按如图方式折叠,使顶点B和点D重合,折痕为EF.若AB=3cm,BC=5cm,则重叠部分△DEF的面积?
She____ (like/likes) apples.