3 2 5(2,5)HIĐROCACBON(1,5)(1,0)25%15%10%1 31 1

2. - KIEM TRA HOC KY
KIEM TRA HOC KY

2.

3

2

5

(2,5)

Hiđrocacbon

(1,5)

(1,0)

25%

15%

10%

1

3