甘草中具有解毒、抗炎、抗癌、抑制艾滋病毒复制作用的甜味成分是() A.甘草苷 B

题型:单项选择题 A1型题

问题:

甘草中具有解毒、抗炎、抗癌、抑制艾滋病毒复制作用的甜味成分是()

A.甘草苷

B.甘草甜素

C.异甘草苷

D.甘草利酮

E.香豆素

考点:初级中药士根及根茎类中药根及根茎类中药题库
题型:单项选择题 A1型题

档案库房的相对温度一般为()℃,比较合适。

A.14---26;

B.14---20;

C.14---16。

题型:单项选择题 A1型题

为了将混有硫酸钠、碳酸氢铵(不稳定,受热易分解生成氨气、二氧化碳和水)的氯化钠提纯,某同学设计的实验流程如图:

试回答下列问题:

(1)操作①的目的是______.操作②能否用硝酸钡溶液?______(填“能”或“否”).

(2)进行操作②后,如何判断SO

 2-4
已除尽,方法是______.

(3)写出操作③有关的化学反应方程式______.操作④的名称是______.

(4)此设计方案是否严密,说明理由______.

(5)原固体样品中含NaCl m1g,最后得到的NaCl固体m2g,则m1______m2(填“>”、“<”或“﹦”)

题型:单项选择题 A1型题

阅读理解。

     A young woman carrying a three-year-old child got on a bus. The conductor hurried to give her a warm

welcome and then kindly asked the other passengers to make more room for the woman and her child. On

seeing this, people began to talk. "You know this conductor used to be very rude. Now suddenly he has

changed his bad behavior," said a middle-aged man. 

     "Yes, he should be praised and we must write a letter to the company," said a second passenger. "That's

right," another lady said, "I wish a newspaper reporter were here so that more people could learn from this

conductor."

     Just then a gentleman who looked like a teacher turned to the conductor and said, "Excuse me, but can

I know your name, please? Your excellent service must be praised..." 

     Before he could open his mouth, the three-year-old child sitting on the young woman's lap interrupted,

"I know his name. I call him Dad."

1. One passenger suggested writing a letter to the company to _____. [ ]

A. make a demand for more buses

B. thank the conductor for his good service

C. criticize the conductor for his rude behavior

D. invite a newspaper reporter to write about the conductor

2. What was the gentleman? [ ]

A. A teacher.

B. A newspaper reporter.

C. Not known from the story.

D. The conductor's friend from his company.

3. The word "him" in the last paragraph refers to _____. [ ]

A. the gentleman

B. the conductor

C. the middle-aged man

D. the three-year-old child

4. It is clear from the story that the conductor _____. [ ]

A. has changed his attitude towards his work

B. has now been kind and polite to all passengers

C. has not changed his rude behavior to passengers

D. has now been kind and polite to women with children

题型:单项选择题 A1型题

油箱油位过低是轴承温度高的原因之一。

题型:单项选择题 A1型题

设计人提交初步设计文件后3日内,发包人应支付设计费总额的( )。

A.10%

B.20%

C.30%

D.40%

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