题目

—What's number of schools in the city? —I'm not sure, but I know there must be number of schools in it. A . on, the B . a, a C . the, the D . the, a 答案：D常温下，下列各组离子在指定溶液中一定能大量两共存的是（　　） A、水电离产生的c（H+）=10-12的溶液：K+、Na+、ClO-、I-B、c（H+）/c（OH-）=10-12的溶液：K+、AlO2-、CO32-、Na+C、硫化钠溶液：Cu2+、SO32-、Br-、H+D、pH=13的溶液：AlO2-、Cl-、HCO3-、SO42-