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)
