A:My mother is serious and she never tells stories to me.
B:My mother is strict and she never tells jokes to me.
C:My mother is strict and she never tells stories to me.
实验序号
金属
状态
c(H2SO4)
/mol•L﹣1
溶液温度/℃
金属消失
的时间/s
反应前
反应后
1
丝
0.7
20
36
250
2
0.8
35
200
3
粉末
25
4
1.0
?
125
5
50
人体组织液中的O2若要进入组织细胞中参与氧化有机物,这些氧分子要通过几层生物膜( )
对该区域地理特征描述不正确的是( )