A:whe
B:who
C:which
D:what
t/℃
0
1
2
3
4
5
6
7
8
ρ/(kg•m﹣3)
999.84
999.90
999.94
999.97
1000.00
999.85
根吸收水分和无机盐的主要部位是根尖的( )