A:硬水和软水的本质区别是硬水含有杂质、软水含杂质少
B:这种蒸馏水绝对纯净,其中不含任何离子
C:这种口服液含有丰富的氮、磷、锌等微量元素
D:没有水就没有生命
下列能源属于化学能的是 ( )
—Haven't seen you for ages! Do you still work in Xi'an?
—________. It's four years since I worked there.