下列化学用语表示正确的是[ ] A.二氧化碳的电子式为: B.乙烷的结构式为:

题型:不定项选择题

问题:

下列化学用语表示正确的是[ ]

A.二氧化碳的电子式为:

B.乙烷的结构式为:

C.甲烷的比例模型为:

D.Cl-离子的结构示意图:

考点:电子式的书写离子结构示意图结构式比例模型
题型:不定项选择题

(10分)化学是在分子、原子水平上研究物质的组成、结构、性质和变化规律的科学。下图为某化学反应的微观模拟示意图:表示氮原子,表示氢原子。请你根据图示回答下列问题:

甲             乙                  丙

1)丙的化学式是          ,一个丙分子是由                  构成的。

2)甲和乙在一定条件下反应生成丙,写出反应的化学方程式               

此反应所属的基本反应类型是               

3)依据图示从微观角度解释此化学变化的实质是                         

题型:不定项选择题

对换热器进行酸洗时,应注意()个方面。

A.两

B.三

C.四

D.五

题型:不定项选择题
完形填空。
     It was five minutes before midnight.
     "They should be home any time," Cindy thought as she finished the last touches on the chocolate cake
she was   1  . The cake didn't taste   2   because she had run out of sugar.
     The kitchen was in a mess (杂乱). Imagine a huge blender filled with all the things for making a chocolate
cake. Now the blender is turned   3  . High speed. Without the lid. Do you get the idea?
     But Cindy wasn't thinking about the kitchen. She was   4   for her parents to return so that she could
present her gift. She turned off the   5   and waited excitedly in the dark. At last she saw the car headlights
flashing and heard the key going into the front   6  .
     Her parents tried to come in   7  . Cindy suddenly turned on the light and laughed loud, "Ta-daaa!" She   8   
to the kitchen table, where the poor chocolate cake stood.
     But her mother's eyes never made it all the way to the table. "Just look at this mess!"
     "But Mom, I was only …"
     "Clean the   9   first thing in the morning!"
     "Honey," Cindy's father said gently, "take a look at the table."
     "I know-it's a mess," his wife said  10 . "The whole kitchen is a  11 ." She stormed up the stairs.
     For a few moments Cindy and her father stood silently,  12  knowing what to say. Finally she looked up at
him, her eyes red. "She never saw the cake," she said. From time to time we all allow ourselves to be  13  to
subjects of long-term importance by something that seems awfully important right now-but isn't. Muddy shoes,
lost lunch money and untidy kitchens are troublesome but what's a little mud compared to a child's  14 ? There
are times when we really need to see the mess in the kitchen, and times when we only need to see the  15 .
( )1. A. getting
( )2. A. good
( )3. A. down
( )4. A. anxious
( )5. A. water
( )6. A. window
( )7. A. quietly
( )8. A. fell
( )9. A. bedroom
( )10. A. nervously
( )11. A. game
(     )12. A. none
( )13. A. blinded
( )14. A. self-awareness
( )15. A. blender
B. ordering
B. strange
B. on
B. shocked
B. light
B. garden
B. hurriedly 
B. led
B. kitchen
B. confusedly
B. disaster
B. all
B. limited
B. self-control   
B. sugar
C. making
C. fresh
C. over
C. sorry
C. TV
C. door
C. calmly
C. referred
C. bathroom
C. carefully
C. loss
C. neither
C. connected
C. self-defense   
C. cake
D. eating
D. salty
D. back
D. moved
D. radio
D. garage
D. sharply
D. pointed                    
D. study
D. coldly
D. surprise
D. either
D. introduced
D. self-respect
D. table
题型:不定项选择题

自强不息:(10分)

“在我们这个社会里,做事极不容易。同治年间起始的自强运动,虽未达到目的,然而能有相当的成绩,已经费了九牛二虎之力。倘若当时没有恭亲王及文祥在京内主持,没有曾国藩、李鸿章、左宗棠在京外推动,那末,英法联军及太平天国以后的中国还要麻木不仁,好像鸦片战争以后的中国一样。”                         

——蒋廷黻《中国近代史》

回答问题:

(1) 材料反映的是中国近代史上的哪场运动?这场运动的目的是什么?(3分)

(2)用史实说明实现“自强”的途径。(4分)

(3)蒋廷黻对这场自强运动持怎样的态度?(1分)

(4) 谈谈你对这场自强运动的看法。(2分)

题型:不定项选择题

信号设备防雷地线与电力、通信等其他地线之间的距离不应小于20m。

更多题库