--- Remember the trip? The scenery there is really breathing-taking. ---Yeah.We also really a good time. A.have B.have had C.had D.has 答案:C 解析: 略25℃时,在含有Pb2+、Sn2+的某溶液中,加入过量金属锡(Sn),发生反应:Sn(s)+Pb2+(aq)Sn2+(aq)+Pb(s),体系中c(Pb2+)和c(Sn2+)变化关系如下图所示。 下列判断正确的是 A.往平衡体系中加入金属铅后,c(Pb2+)增大 B.往平衡体系中加入少量Sn(NO3)2固体后,c(Pb2+)变小 C.升高温度,平衡体系中c(Pb2+)增大,说明该反应△H>0 D.25℃时,该反应的平衡常数K=2.2