There is no reason why you should tell them ______ that you are going.
A. for advance
B. in advance
C. on advance
D. of advancing
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______ had I closed the door ______ somebody started knocking at it.
As soon as, then
B. Although, yet
C. No sooner, than
D. If, then
( )是基于因果关系的基本逻辑，把研究问题置于特定场境中，通过严格的控制和策划，使得所研究变量及其关系得以体现。
A. 问卷调查
B. 实验研究
C. 定性研究
D. 非干扰性研究
加入后改善凡士林吸水性的物质是
A. 鲸蜡
B. 植物油
C. 液体石蜡
D. 羊毛脂
E. 聚乙二醇
贵重药物及刺激性药物采用的粉碎方法是
A. 单独粉碎
B. 混合粉碎
C. 串研
D. 干法粉碎
E. 湿法粉碎
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