无色亚甲蓝反应可用于检识的成分是（） A.蒽醌 B.香豆素 C.黄酮类

单词拼写。

1. He has a (n) ___________ (名声) for honesty, so the leaders all believe in him.

2. I know you don't like her, but try not to make it so ___________ (明显的).

3. _____________ (自然地), as a beginner, I'm not a very good driver yet.

4. People never trust him because he is always l__________.

5. Timoteo v_____________ to direct the traffic at the Devil's bend. No one asked him to do so.

慢性Ⅱ型呼吸衰竭患者的吸氧方法是()

A．高浓度氧

B．纯氧

C．高压吸氧

D．低浓度、低流量持续吸氧

E．间歇吸氧

关于视觉诱发电位（VEP）的描述错误的是（）

A.记录的是视网膜的电活动

B.反映视网膜、视路和视觉中枢的功毹状态

C.分为闪光视觉诱发电位和图形视觉诱发电位

D.可用于视路病变的诊断

E.可用于视中枢病变的诊断

试述农产品质量安全监督面临的主要问题与发展措施。