水的硬度分为()硬度和()硬度。
参考答案:暂时、永久
---So you haven't read the information form?
---_________makes the matter worse is that I don't have a single copy.
A.It
B.What
C.That
D.Which
下列指定反应的离子方程式正确的是()
A.将铜插入稀硝酸中:
B.向Fe2(SO4)3溶液中加入过量铁粉:
C.向Al2(SO4)3溶液中加入过量氨水:
D.向Na2SiO3溶液中滴加稀盐酸: