问题 单项选择题

洗脱液的质量控制下列哪种说法是错误的()。

A.99mMo可增加对患者的辐射吸收剂量、影响显像质量,其含量应低于0.1%

B.载体99mTc可由99mMo和99mTc衰变产生,其含量随淋洗时间间隔和洗脱液放置时间增长而增高,故应多延长淋洗时间

C.Al可影响放射性药物的标记和体内分布,如可使某些放射性药物在肝脾中浓聚,Al含量应低于10μg/ml

D.99mTc增长到最大值的时间为22.8小时

E.99mMo含量可用740~780keV能谱分析测定

答案

参考答案:B

解析:淋洗时间间隔和洗脱液放置时间增长,由于射线对水的辐射分解产生的过氧化物游离基含量还会增加,影响洗脱液质量,故一般淋洗时间间隔为24小时。

阅读理解

The secret of happiness

An old man walked slowly with a cane(手杖)into the restaurant .His old jacket, worn-out shoes and warm personality made him stand out from the usual crowd.

A young waitress watched him move toward a table by the window. She ran over to him, and said: “Here, sir……let me help you with that chair.”

Without saying a word, he smiled and nodded(点头)a thank you. She pulled the chair away from the table and helped him sit. Then she put his came against the table.

“Thank you, miss.”he said, kindly.

“You’re welcome, sir.”she said.

After he had finished his breakfast, the waitress brought him the change(零钱)from his bill. He left it on the table. She helped him up and walked with him to the front door.

When she went to clean his table, she found a business card under his plate and note on a napkin(纸巾). Under the napkin was a 100-dollar bill.

The note on the napkin read: “Dear miss, I respect you very much and I can see you respect yourself, too. It shows by the way you treat others. (3)You have found the secret of happiness. Your kindness will shine through to all those who meet you.”

The man she had waited on was the owner of the restaurant where she worked. This was the first time that she or any of the other workers had ever seen him in person.

By Steve Brunkhorst

小题1:The old man left﹩100 under the napkin because he

A.had a habit of giving tips to waitresses

B.thought the meal was delicious

C.wanted to thank the waitress for her good attitude

D.learned the secret of happiness from the waitress小题2:What do we know about the waitress and the old man?

A.The waitress knew who the old man was from the note.

B.The waitress knew the old man before she served him.

C.The old man wanted to have the waitress as his secretary.

D.It was the first time that the waitress had ever seen her boss.小题3:We can tell from the story that the old man went to the restaurant to     .

A.have a good meal

B.enjoy good service

C.see the restaurant for himself

D.show his love for common people小题4:The underlined phrase“waited on”means     .

A.looked at

B.served

C.waited for

D.Found

名词解释