单项选择题

According to acid-base proton theory,The following substance that can be used as either an acid or an alkali in an aqueous solution is:().

A．Cl-
B．NH4+
C．HCO3-
D．H3O+

你可能感兴趣的试题

单项选择题

穿着西装，钮扣的扣法很有讲究，穿着西装，不管在什么场合，一般都要将扣子全部扣上，否则会被认为轻浮不稳重。

A.错误
B.正确

单项选择题

The charity organization, “Heal the World Foundation”, was designed to improve the lives of minority group.

A．对
B．错