I'll stay here _____ everyone else comes back.
A.even if
B.as though
C.because
D.until
答案:D
可用EDTA法测定含量的药物是()。
A.硫酸锌
B.硫酸钠
C.碘酊中碘化钾
D.硫酸亚铁
E.维生素C
SPA