引发牙髓感染的途径包括()。 A.暴露的牙本质小管 B.牙髓暴露 C.牙周途径 D.

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问题:

引发牙髓感染的途径包括()。

A.暴露的牙本质小管

B.牙髓暴露

C.牙周途径

D.血源性感染

E.以上都是

考点:口腔医学(医学高级)口腔医学综合练习口腔医学综合练习题库
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子基金之间可以进行相互转换的基金是( )。

A.股票型基金
B.债券型基金
C.货币市场基金
D.系列基金

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最近,我国有科学家采用铝铍埋藏测年法的技术手段测定,北京猿人生活在约七十七万年前,此前,根据其他测年法,学术界采信“四五十万年前”的说法,上述考古研究情况表明

①任何具体实践对认识真理性的检验都具有局限性

②专家公认的检验手段和考古结论具有更高的可靠性

③不同的考古实践手段必然得出不同的考古结论

④不同考古结论应不断接受新的考古实践的再检验

A.①②

B.②③

C.③④

D.①④

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函数f(x)=kx2-
|x|
x+4
(k∈R)的零点个数最多是(  )
A.1B.2C.3D.4
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Christmas Eve means a warm get-together with friends, a candlelight dinner, or perhaps a celebration at a pub for students. But, for Cai Yingjie, the night has a different meaning: helping beggars(乞丐)and the homeless(people without homes).

Cai, who is a student in journalism at Tsinghua, could be found at Beijing’s Wudaokou Light Railway Station that special evening. When she saw an old beggar, she took the cold, rough hands of the woman with her warm, clean hands, and gave the woman some warm bread and helped her put on a pair of new gloves.

The woman was surprised for a few seconds, then burst into tears, saying “for the first time I feel respected”.

Cai said, “A beggar’s life is very hard. That’s why I want to help them.”

Cai was one of 14 Tsinghua students spending Christmas Eve among the poor. They walked in the cold wind along the streets from 4 to 7 pm on Friday, visiting 15 beggars in Beijing’s Haidian District.

They brought bread and gloves with them, and stopped to greet beggars and offer them some of the warm food. Each beggar greeted them with a look of surprise.

“I know the activity can’t help much, but it’s meant to show our respect and care for beggars and the homeless who have been neglected for so long,” said Sun, head of the group. “And Christmas is a good time for that.”

小题1:What does Christmas Eve mean to the 14 Tsinghua students?

A.Taking 15 beggars to Tsinghua.

B.Getting together with friends.

C.Showing care to the beggars and the homeless.

D.Selling bread and gloves to the beggars.小题2:What does the beggar mean by saying “for the first time I feel respected”?

A.The beggar has been waiting for Cai for long.

B.The beggar hasn’t been shown care for so long.

C.The beggar has been respecting Cai for a long time.

D.This is the first time the beggar has seen Tsinghua students.小题3:What did each beggar feel when they received greetings?

A.Sad.

B.Amazed.

C.Frightened.

D.Proud.小题4:The word “neglected” in the last passage means _______.

A.protected

B.found

C.taken care of

D.given no enough care

题型:单项选择题

浮艇泵在什么情况下严禁启动?()

A.无油的情况下

B.无水的情况下

C.没电的情况下

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