下列变化中,最小粒子是原子的是[ ]
A.水受热汽化
B.贮氮气的钢瓶受热爆炸
C.氧气难溶于水
D.水通电生成氢气和氧气
D
一例额骨,蝶骨大翼、蝶骨小翼、颧骨增厚及密度增高,骨结构紊乱,见于:()
A.硬化性骨髓炎
B.骨结核
C.骨瘤
D.石骨症
E.骨纤维异常增殖症
Columbus had accomplished one of the most amazing and courageous________in history.
A.performance
B.feats
C.events
D.acts