钢材的屈服强度与抗拉强度的比值称为屈强比。屈强比越小,说明()。A.钢材越硬 B.钢

题型:单项选择题

问题:

钢材的屈服强度与抗拉强度的比值称为屈强比。屈强比越小,说明()。

A.钢材越硬

B.钢材越软

C.结构可靠性越高

D.安全储备小

考点:桥梁检测员桥梁检测员题库
题型:单项选择题

要准确判断发电机性能,必须对发电机进行()转速试验。

A.空载和满载

B.空载

C.满载

题型:单项选择题

油层定位短节,接在距主要油层顶界面以上()m处。

A、100

B、10

C、20~50

D、60~100

题型:单项选择题

女,57岁,主诉:牙龈反复肿痛2个月。检查:多数牙的牙龈肥大增生,牙周溢脓,牙齿松动、移位,全身患有高血压、心脏病、神经衰弱。

若此病人已排除糖尿病与牙龈增生、肥大的原因最相关的是长期服用()

A.消心痛

B.硝基吡啶

C.消炎痛

D.苯妥类钠

E.环霉菌素

题型:单项选择题

When I was looking for a Christmas present for my daughter in a toy store, a nicely dressed little girl, with some money in her little hand, was looking at some beautiful dolls. When she saw a doll she liked, she would ask her father if she had enough money. He usually said yes.

At the same time, a boy, with old and small clothes, was looking at some video games. He, too, had money in his hand, but it looked no more than five dollars. Each time he picked up one of the video games and looked at his father, he shook his head.

The little girl had chosen her doll, a very beautiful one. However, she noticed the boy and his father. She saw the boy give up a video game with disappointment and walk to another corner of the store.

The little girl put her doll back to the shelf and ran over to the video game. After she talked to her father, she paid for the video game and whispered(耳语) to the shop assistant.

So the boy got the video game that he wanted for free—he was told it was a prize from the store. He smiled happily, although he felt it was so incredible. The girl saw all this happen. She smiled, too.

When I walked out of the store to my car, I heard the father ask his daughter why she had done that. I would never forget their short talk. " Daddy, didn’t Grandma want me to buy something that would make me happy"

He said, "Of course, she did. "

"Well, I just did!" With that, the little girl started skipping towards their car happily.

The story happened in a ().

A.school

B.toy store

C.cinema

D.computer room

题型:单项选择题

精确测量用红外热像仪的启动时间应小于()。

A.1min

B.2min

C.3min

D.4min

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