碱洗塔蒸煮合格的标准是()。
A、蒸煮12小时
B、蒸煮24小时
C、蒸煮排出的水清洁
D、蒸煮时水满塔
参考答案:C
Only according to the directions can the medicine be quite effective .
A.taking
B.taken
C.being taken
D.having been taken
粗制凡士林(石油原油的蒸馏残渣制得)