A.25;0.3~0.4 B.28;0.4~0.45 C.38;0.4~0.45 D.28;0~0.2
A.t1<t2 B.t1>t2 C.t1=t2 D.t1≤t2
A.NaOH與CaCO3 B.Na2SO4與CaC12 C.Ca(OH)2與NaC1 D.NaC1與CaCO3