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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】利用选择性系数可以估计干扰离子带来的误差,若Kij=0.05,干扰离子的活度为0.1mol/L,被测离子的活度为0.2mol/L,其百分误差为:
A.
2.5
B.
5.0
C.
10
D.
20