只要原子量和原子序是固定的，它的结合能就是固定的。
参考答案：对
— Could you show me _______?
— Sure.
A．what can I do with the bike
B．how I could do with the bike
C．which was the way to the zoo
D．where he lives
To the surprise of many people, in ten years the city’s population _______ by 12%.
A．gained
B．expanded
C．developed
D．spread
