蛋白质二级结构是指分子中() A.氨基酸的排列顺序 B.每一氨基酸侧链的空间构象 C

题型:单项选择题 A1型题

问题:

蛋白质二级结构是指分子中()

A.氨基酸的排列顺序

B.每一氨基酸侧链的空间构象

C.局部主链的空间构象

D.亚基间相对的空间位置

E.每一原子的相对空间位置

考点:公卫执业助理医师公卫执业助理医师综合练习公卫执业助理医师综合练习题库
题型:单项选择题 A1型题

属于醌类抗生素及其衍生物的是()

A.阿糖胞苷

B.多柔比星

C.米托蒽醌

D.柔红霉素

E.博来霉素

题型:单项选择题 A1型题

下列关于征税的表述,错误的是()

A、海关征税基本法律依据是《海关法》《关税条列》等法律法规

B、征税工作包括征收关税、增值税和消费税

C、关税的征收主体是海关,其他任何单位和个人不得行使征收关税的权力

D、关税课税对像是进出口货物、进出境运输工具和进出境物品

题型:单项选择题 A1型题

It had been some time since Jack had seen the old man. College, career, and life itself got in the way. In fact, Jack moved clear across the country in pursuit of his dreams. There, in the rush of his busy life, Jack had little time to think about the past and often no time to spend with his wife and son. He was working on his future, and nothing could stop him.

Over the phone, his mother told him, “Mr. Belser died last night. The funeral is Wednesday.” Memories flashed through his mind like an old newsreel(纪录片) as he sat quietly remembering his childhood days.

“Jack, did you hear me?”

“Oh, sorry, Mom. Yes, I heard you. It’s been so long since I thought of him. I’m sorry, but I honestly thought he died years ago,” Jack said.

Well, he didn’t forget you. Every time I saw him he’d ask how you were doing. He’d reminisce (回忆) about the many days you spent over ‘his side of the fence’ as he put it,” Mom told him.

“I loved that old house he lived in,” Jack said.

“You know, Jack, after your father died, Mr. Belser stepped in to make sure you had a man’s influence in your life,” she said.

“He’s the one who taught me carpentry. I wouldn’t be in this business if it weren’t for him. He spent a lot of time teaching me things he thought were important… Mom, I’ll be there for the funeral,” Jack said.

Busy as he was, he kept his word. Jack caught the next flight to his hometown. Mr. Belser’s funeral was small and uneventful. He had no children of his own, and most of his relatives had passed away.

The night before they had to return home, Jack and his Mom stopped by to see the old house next door one more time, which was exactly as he remembered. Every step held memories. Every picture, every piece of furniture… Jack stopped suddenly.

“What’s wrong, Jack?” his Mom asked.

“The box is gone,” he said.

“What box?” Mom asked.

“There was a small gold box that he kept locked on top of his desk. I must have asked him a thousand times what was inside. All he’d ever tell me was ‘the thing I value most’,” Jack said.

It was gone. Everything about the house was exactly how Jack remembered it, except for the box. He figured someone from the Belser family had taken it.

“Now, I’ll never know what was so valuable to him,” Jack said sadly.

Returning to his office the next day, he found a package on his desk. The return address caught his attention.

“Mr. Harold Belser” it read.

Jack tore open the package. There inside was the gold box and an envelope. Jack’s hands shook as he read the note inside.

“Upon my death, please forward this box and its contents to Jack Bennett. It’s the thing I valued most in my life.” A small key was taped to the letter. His heart racing, and tears filling his eyes, Jack carefully unlocked the box. There inside he found a beautiful gold pocket watch. Running his fingers slowly over the fine cover, he opened it.

Inside he found these words carved: “Jack, Thanks for your time! Harold Belser.”

“Oh, My God! This is the thing he valued most…”

Jack held the watch for a few minutes, then called his assistant and cleared his appointments for the next two days. “Why?” his assistant asked.

“I need some time to spend with my son,” he said.

小题1:Why did Jack think Mr. Belser died years ago?

A.College and career prevented him from remembering Mr. Bleser.

B.Jack was too busy with his business and family to think about Mr. Belser.

C.Jack was too busy realizing his dreams to think about Mr. Belser.

D.His present busy life washed away his childhood memories.小题2:Jack’s mother told him on the phone about Mr. Belser EXCEPT that ______.

A.Mr. Belser often asked how Jack was doing

B.Mr. Belser’s funeral would take place on Wednesday

C.Mr. Belser had asked for Jack’s mailing address

D.Mr. Belser had pleasant memories of their time together小题3:Why did Jack say he needed some time to spend with his son?

A.He was very tired of his work and wanted to have a good rest.

B.He had promised to spare more time to stay with his son.

C.He had missed his son and his family for days.

D.He came to realize the importance of the time with his family.小题4:Which of the following is the most suitable title for this passage?

A.The Good Old Times

B.What He Valued Most

C.My lost friend

D.The Lost Childhood Days

题型:单项选择题 A1型题

可摘局部义齿优于固定义齿之处是()

A.磨牙少,易于保持口腔卫生

B.义齿的佩戴舒适、美观

C.义齿的咀嚼效率高

D.义齿的强度好

E.义齿的固位力较好

题型:单项选择题 A1型题

影响X线衰减的因素不包括

A.X线的能量

B.吸收物质的原子序数

C.物质的密度

D.每克物质的电子数

E.电源电压

更多题库