单项选择题
A.0.4%~0.8%B.0.2%~0.4%C.0.1%~0.2%D.0.05%~0.1%
A.95.5%~97.5%B.96.5%~98.5%C.97.5%~99.5%D.98.5%~101.5%
A.钠、钙B.镍、钡C.铜、锑D.硅、铝