A:该金属的逸出功等于W
B:该金属的逸出功等于hv0
C:入射光的频率为2v0时,产生的光电子的最大初动能为2W
D:图线的斜率表示普朗克常量h.
—Excuse me, sir, there is _____ tea in your cup, would you like some more? —Yes, please. And give me _____ mooncake. It tasted delicious.
北京市位于华北平原的北部边缘,其地势特点是( )