The water level showing in a boiler water gauge glass is usually () duringworking.
A. higher than the actual drum water level
B. equal to the actual drum water level
C. increasing due to steam condensation in the glass
D. lower than actual drum wafer level
苦味中药的作用是
A. 发散.行气.行血
B. 收敛固涩
C. 软坚散结.泻下
D. 燥湿
E. 渗湿利水
属于C-苷的化合物是
A. 芦荟苷
B. 巴豆苷
C. 红景天苷
D. 山慈菇苷A
E. 苦杏仁苷
分离具有酸性和碱性化合物可用
A. 分配色谱
B. 离子交换色谱
C. 吸附色谱
D. 大孔树脂色谱
E. 凝胶过滤色谱
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