A:P的初动能
B:P的初动能的1/2
C:P的初动能的1/3
D:P的初动能的1/4
What about ____ (go) to the Great Wall for our summer holiday?
地球的平均半径是:( )
①干冰的升华; ②硫酸钾熔化; ③NaCl溶于水; ④HCl溶于水; ⑤液氨的受热蒸发; ⑥Na2O2溶于水