已知Sn=2+24+27+210+…+23n+10(n∈N*),则Sn=____

题型:填空题

问题:

已知Sn=2+24+27+210+…+23n+10(n∈N*),则Sn=______.

考点:数列求和的其他方法(倒序相加,错位相减,裂项相加等)
题型:填空题

下图是工业上制备氢气的微观示意图,其中不同的“球”代表不同原子。下列说法不正确的是(   )

A.图中能表示氢分子的是“

B.反应前后,原子的种类、数目不变

C.该反应中共涉及两种单质和两种化合物

D.该反应中参加反应的两种分子的个数比为1:1

题型:填空题

There was a man. He had four sons. He wanted his sons to learn not to judge things too quickly. So he sent them each on a quest(探索)in turn, to go and look at a pear tree that was far away. The first son went in the winter, the second in the spring, the third in the summer, the youngest son in the fall. When they had all gone and come back, he called them together to describe what they had seen. The first son said that the tree was ugly ,bent and weak. The second son said no---it was covered with green buds and full of promise. The third son said it was laden with blossoms and they smelt so sweet and looked so beautiful. The last son disagreed with all of them. He said it was ripe and drooping(下垂 )with fruit, full of life and fulfillment.. The man then said to his sons that they were all right, because they each had seen but only one season in the tree’s life. He told them that they cannot judge a tree or a person, by only one season, and that the essence(本质) of who they are---- the pleasure, the joy and love that come from that life---can only be measured at the end (盖棺论定),when all the seasons are up.    If you give up when it is in winter, you will miss the promise of your spring, the beauty of your summer, the fulfillment of your fall. Don’t let the pain of one destroy the joy of all the rest.

小题1:Why did the man sent his sons each on a quest?

小题2:When did the fourth son go?

小题3:What did the third son say when they came back?

小题4: Did the man agree with all of his sons?

小题5:Which season will you miss If you give up when it is in winter?

题型:填空题

中国画最强调用()造型。

A.色彩

B.线条

C.明暗

D.透视原理

题型:填空题

下壁心肌梗死()

A.Ⅴ1-Ⅴ5ST段抬高,异常Q波形成

B.Ⅱ、Ⅲ、aVF、ST段抬高,异常Q波形成

C.Ⅴ5-V7、Ⅱ、Ⅲ、aVF、ST段抬高,异常Q波形成

D.Ⅰ、aVILST段抬高,异常Q波形成

E.Ⅱ、Ⅲ、aVF、Ⅴ3R-Ⅴ6R、ST段抬高,异常Q波形成

题型:填空题

马钢股份和中信国安分别于2006年和2007年发行了认股权和债券分离交易的可转换公司债券,该产品的上市是金融工程的( )技术的具体应用。

A.分解
B.组合
C.整合
D.复制

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