单项选择题

下列备选答案中表示植物根或茎中“下皮层”的是

A．endodermis
B．cortex
C．exodermis
D．epidermis
E．hypodermis

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热门试题

单项选择题

The physico-chemieal characteristics of rutinis（）

A．gradual reddening on exposure to light
B．Soluble in cold water
C．Completely soluble in alcohol,acetone
D．easily soluble in chloroform
E．soluble in alkaline solutions

单项选择题

To apply this eye medication,wash hands first．To avoid contamination,be careful not to touch the dropper or let it touch the affected area．Place the dropper directly over the eye and administer the prescribed number of drops．Look downward and gently close your eyes for 1 to 2 minutes．According to the above,which of the following is not correct（）

A．上药前洗手
B．注意不要使眼药水瓶口接触患处
C．滴好药水后睁开双眼l～2分钟
D．滴好药水后双眼下望
E．按处方规定的滴数使用