过滤灭菌法最合适
A.林格液 B.液状石蜡与磺胺粉 C.维生素C注射剂 D.胰岛素注射剂 E.磺胺粉
参考答案:D
—Excuse me, is this your ring?
—Yes.______. [ ]
A. is it
B. it's
C. it is
D. it isn't
减小吸收阻力,可以提高吸收速率。