The writer of the article does not express the view, either directly or by implication, that ______.
A. sharply defined classifications of taste are needed
B. more research should be done regarding the molecular constituency of food
C. food values are objectively determined by an expert "smeller"
D. temperature is an important factor in the value of food
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Van Deemter方程
A. 塔板高度与流动相流速关系式
B. 流动相需要高压泵才能输送
C. 电场强度增大，分离趋于完全
D. 十八烷基硅烷键合硅胶
E. 甲基硅橡胶SE-30或OV-1
我国人均林地面积不到世界人均水平的( )。
A. 50%
B. 40%
C. 30%
D. 20%
Why do boys and girls in co-education have no illusion about each other
A. They live together and know each other too well.
B. Frequent contacts help dismiss such illusion.
Co-education encourages them to have a healthy attitude toward life.
D. They are familiar with each other's problems.
柱效
A. 不含黏合剂而含有荧光剂的硅胶
B. 薄层色谱法的基本定性参数
C. 两组分的调整保留值之比
D. 由保留时间和半峰宽计算理论塔板数
E. 分配系数为零的组分的保留时间
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