A:Ca2+、NO3ˉ、CO32-、Na+
B:Na+、Ba2+、Mg2+、HCO3ˉ
C:NO3ˉ、Cu2+、K+、Clˉ
D:NO3ˉ、K+、AlO2ˉ、OHˉ
风筝厂两周后能按时交货吗?
①Super time but can't play a game tall and big our guest
②what can your father do he can ride a bicycle