乳化稳定性
参考答案：
通常以乳化后，其乳状液在一定温度下放置一定时间前后的体积变化值表示。
立磨密封风机的作用是（），降温。
Specific duties are levied ______ some physical unit such as dollars per bushel, per kilo, or per metre and ad valorem duties are calculated as a percent of the value of the goods.
A．on the basis of
B．with the basis of
C．on the base of
D．with the base of
