A:v(B2)=0.8 mol/(L•s)
B:v(A2)=0.4 mol/(L•s)
C:v(C)=0.6 mol/(L•s)
D:v(B2)=1.0 mol/(L•s)
平行的两条直线永远不会相交.
- What can she do? - She can skip rope.