VmLpH=a的NaOH溶液中滴加pH=b的盐酸10VmL时,溶液为中性,
则VmL×0.001L/mL×10 a-14=10VmL×0.001L/mL×10 -b,
即10 a+b-15=1,
则a+b-15=0,所以a+b=15,
故选C.