从统计发挥作用的层次来看,统计工作的基本职能可概括为信息职能、()和()。

题型:填空题

问题:

从统计发挥作用的层次来看,统计工作的基本职能可概括为信息职能、()和()。

考点:统计学统计学综合练习统计学综合练习题库
题型:填空题

某单位有年轻职工21人,中年职工14人,老年职工7人.现采用分层抽样方法从这些职工中选6人进行健康调查.若从选取的6人中随机选2人做进一步的调查,则选取的2人均为年轻人的概率是______.

题型:填空题

下列神经不是腰丛的分支的是()

A.生殖股神经

B.股外侧皮神经

C.股神经

D.坐骨神经

E.髂腹下神经

题型:填空题

Are you a man or a mouse When people ask this question they want to know (1) you think you are a (2) person or a coward. But you will never really know the answer to this question (3) you are tested in real life. Some people (4) they are brave but when they come face to face with real (5) , they act like cowards. Others think of themselves as cowards, but when they meet danger, they act like (6)

Lenny had always thought of himself as a (7) person. He got worried before examinations. He worried about his job and health. All he wanted in life was to be safe and healthy. (8) , on January 15th, 2002, a plane crashed into the Potomac River in Washington. Lenny went to the river to see what was happening. He saw a woman in the (9) water. Lenny did not feel afraid. He kept very (10) and did a very dangerous thing. He jumped into the Potomac, (11) to the woman, and kept her head (12) the water. Seventy-eight people died that day. Thanks to Lenny, it was not (13) .

When you are in a very (14) situation and feel afraid, the body automatically produces a chemical in the blood. The chemical is called adrenalin. (15) adrenalin in the blood system, you actually feel per and per and are (16) to fight or run away. However, when you are absolutely terrified, the body can produce too much adrenalin. When this (17) , the muscles become very hard and you find you (18) move at all. You are then paralyzed with fear. This is (19) when we are very frightened, we sometimes say we’re "petrified". This word comes from the Greek word "petros", which means "stone". We are (20) frightened that we become stonelike.

14()

A.dangerous 

B.comfortable 

C.different 

D.favorable

题型:填空题

滚珠丝杠副的公称直径do应取为_____。

A.小于丝杠工作长度的1/30

B.大于丝杠工作长度的1/30

C.根据接触角确定

D.根据螺旋升角确定

题型:填空题

阅读《氓》第五、六章,然后回答下列问题。
三岁为妇,靡室劳矣。夙兴夜寐,靡有朝矣。言既遂矣,至于暴矣。兄弟不知,咥其笑矣。静言思之,躬自悼矣.
及尔偕老,老使我怨。淇则有岸,隰则有泮。总角之宴,言笑晏晏。信誓旦旦,不思其反。反是不思,亦已焉哉!

女主人公嫁到氓家三年受到什么样的待遇

更多题库