A:用食醋清洗热水瓶中的水垢【主要成分是CaCO3和Mg(OH)2】
B:用煤气灶燃烧天然气为炒菜提供热量
C:烧菜用过的铁锅,经放置常出现红棕色斑迹
D:牛奶久置变质腐败
When Tom got to the examination room, he realized he ______ his pen at home.
下列各数中,大于-12小于12的负数是( )