设曲线y=xn2+n(n∈N*)在点(1,1)处的切线与x轴的交点的横坐标为xn

题型:选择题

问题:

设曲线y=xn2+n (n∈N*)在点(1,1)处的切线与x轴的交点的横坐标为xn,则数列{xn}前10项和等于(  )
A.
100
11
B.
1
11
C.
120
11
D.
101
10
考点:函数的极值与导数的关系数列求和的其他方法(倒序相加,错位相减,裂项相加等)
题型:选择题

根据短文意思和拼音提示在括号中填写词语。

  每当其间显现一座石桥时,仿佛发闷的苇丛做了一次深呼吸,透了一口shū chàng(  )的气。那拱桥的强劲的大hú xiàn(  ),或方桥的单纯的直线,都恰好与芦苇丛构成鲜明的对照。早春天气,江南乡间石桥头细柳飘丝,那xiān xì(  )的游丝拂着桥身坚硬的石块,即使碰不见晓风残月,也令画家

xiāo hún(  )!

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患者男性,36岁,右侧锁骨及桡骨骨折。拟行桡骨切开复位术。

麻醉后5分钟患者突然烦躁不安、多语、继而抽搐,最可能的诊断是()

A.气胸

B.局麻药中毒反应

C.局麻药过敏

D.肾上腺素反应

E.高平面硬膜外阻滞

题型:选择题

出血坏死型胰腺炎时的Cullen征是指()

A.胁腹皮肤呈灰紫色斑

B.脐周皮肤呈灰紫色斑

C.胁腹皮肤青紫

D.脐周皮肤青紫

E.脐周皮肤红斑

题型:选择题

In every language, there are words or phrases that have some interesting stories behind them. The word “sandwich”, for example, is very common in English. If we want to know the story behind it, we must know something about an English nobleman (贵族) called Sandwich.

Sandwich lived in the 18th century. He liked to play cards for money. He often played for twenty four hours, and not even stop to have his meal. He ordered his servants to bring some meat and bread, and he played while eating. He put the meat between two pieces of bread, and he held the food in his left hand while he played with his right hand. People liked Sandwich’s idea and began to eat bread and meat in this way.

From the name of the man Sandwich, we have the word “sandwich” today.

1 Sandwich is very popular food today, which comes from ____ .

A. a man’s name    B. people’s idea      C. a servant’s name D. a nobleman’s play

2 What did Sandwich play cards for?

A. Pleasure.    B. Living.       C. Food.  D. Pounds.

3Which of the following can best explain the reason why Sandwich did not stop to have his meals?

A. He played cards with his right hand.

B. He put the meat between two pieces of bread.

C. He played cards for twenty four hours.

D. He played cards while eating.

4 The best title for the passage should be “____”.

A. How Sandwich Played Cards

B. How the Word “Sandwich” Came into Use

C. A Bright Idea

D. An Interesting Story

题型:选择题

可以耦联生成T4的是()

A.一碘甲腺原氨酸

B.二碘甲腺原氨酸

C.三碘甲腺原氨酸

D.四碘甲腺原氨酸

E.逆-T3

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