单项选择题
A.尿酸盐 B.磷酸盐 C.碳酸盐 D.非晶形磷酸盐 E.草酸盐
A.30min B.1h C.3h D.2h E.4h
A.80.5% B.85.5% C.88.5% D.90.5% E.95.5%