纯钛铸件铸造后采用哪一种冷却方式比较好() A.室温下慢慢冷却 B.热水冷却 C.凉

题型:单项选择题

问题:

纯钛铸件铸造后采用哪一种冷却方式比较好()

A.室温下慢慢冷却

B.热水冷却

C.凉水中快速冷却

D.室内放置0.5h后再用凉水冷却

E.室内放置1h后再用凉水冷却

考点:口腔内科(医学高级)医学高级(口腔内科)仿真试题十三
题型:单项选择题

阅读理解。

     December 25th is Christmas Day. In Western countries it is the most important day in the year. All the

people come back to their homes and have the day with their parents or their children. On Christmas Day

bells ring everywhere. The ringing bell tells people Christmas is coming. People sing and dance day and night.

They have a good time.

     Most families buy Christmas trees for their children. And there are some presents hanging from the trees

here and there. On Christmas Eve children are very happy. They put stockings at the end of their beds so

that their parents can put presents in them. In many places, Father Christmas brings presents to them. He is

a kind man in red clothes. There is a big bag on his back. In it there are a lot of presents.

根据短文内容判断下列正(T)误(F)。

( ) 1. In Western countries December 25th is the most important day because it is Christmas Day.

( ) 2. The day before December 25th, the bells ring here and there.

(     ) 3. Parents usually buy Christmas trees and put all presents under them.

(     ) 4. On Christmas Eve, children usually put their stockings at the end of their parents' beds.

(     ) 5. Father Christmas often wears red clothes with a big bag on his back.

题型:单项选择题

下列哪种病原不是一类病原()

A.口蹄疫病毒

B.高致病性禽流感病毒

C.猪水疱病病毒

D.鸭瘟病毒

E.小反刍兽疫病毒

题型:单项选择题

下列现象中,能表明分子在不停地做无规则运动的是(   )

A.蒙蒙细雨从空中下落

B.擦黑板时,粉笔灰在空中飞舞

C.冬季北方城市出现的雾霾

D.炒菜时,满屋飘香

题型:单项选择题

短时记忆存储的信息量为

A.3±2

B.5±2

C.7±2

D.9±2

E.11±2

题型:单项选择题

以下为直接融资方式的是()

A.政府发行国债

B.企业购买公司债券

C.自然人之间的民间借贷

D.企业向银行贷款

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