根据公式,Q=cm△t,可得,m=Q/c△t
所以,m1：m2=Q/c1△t1：Q/c2△t2=[Q/(c1×△t1)]×[(c1×△t1)/Q]=(c2×△t2)/(c1×△t1)=3×1/1×2=3:2
所以选A
如不懂,