It’s reported that in some families there have been more than one person           the Nobel Prize.

函数是单调函数时，的取值范围（   ）

——Mike, what did our monitor say just now?
—— Every boy and every girl as well as the teachers who _____ to visit the museum _____ asked to be at the school gate before 6:30 in the morning.

用托盘天平测物体质量，天平调节平衡后，按正确使用方法称量物体质量时，发现右盘下沉，这时应采取的措施是（  ）

己知：NH₃•H₂O（aq）与H₂SO₄（aq）反应生成1mol正盐的△H=﹣24.2kJ/mol；强酸、强碱的稀溶液反应的中和热的△H=﹣57.3kJ/mol．则NH₃•H₂O在水溶液中电离的△H等于（   ）