酸值是指中和（）固体醇酸树脂中的游离酸所需的KOH质量（mg）。
A、1kg
B、1g
C、1升
D、1mlt
参考答案：B
存货的经济批量是指能够使一定时期存货的总成本达到最低的订货批量。（）
It is generally believed that reading is______it is ascience. [ ]
A. an art much as
B. much an art as
C. as an art much as
D. as much an art as
