—Well, it's a little far from here. What about ______ shared bikes?
A:to walk; to ride
B:to walk; riding
C:walk; to ride
D:walk; riding
某温度(t℃)时,测得0.01mol/L的NaOH溶液的pH=11.在此温度下,将pH=2的H2SO4溶液VaL与pH=12的NaOH溶液VbL混合,若所得混合液为中性,则Va:Vb=____ .