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举一反三
【单选题】Ladies and gentlemen, welcome to Dalian, a famous summer resort ( 避暑胜地 ) and one of the best tourist cities in China. With clear sky, green mountains, blue seas, fine beaches, clean streets and lovely...
A.
comes in the best season.
B.
is here to join more tourists
C.
may not stand the heat here.
D.
is traveling back home.
【单选题】下列各组离子在pH=10的溶液中一定能大量共存的是（ ）
A.
H+、Cl-、NO3-
B.
Na+、NH4+、CO32-；
C.
Ba2+、Na+、Cl-
D.
Mg2+、SO42-、NO3-