There are many __________ in the Beijing Train Station.[ ]
A. people
B. man
C. woman
答案:A
某小儿体重11kg,身长81cm,前囟已闭,头围47cm左右,胸围大于头围,牙齿12枚,最可能的年龄为()
A.1岁
B.1岁半
C.2岁
D.2岁半
E.3岁
乙炔、氢气、硫化氢等气属于()气体