(8分) 氮元素的氢化物和氧化物在工业生产和国防建设中都有广泛应用,回答下列问题

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问题:

(8分)

氮元素的氢化物和氧化物在工业生产和国防建设中都有广泛应用,回答下列问题:

(1)氮元素原子的L层电子数为       

(2)NH3与NaClO反应可得到肼(N2H4),该反应的化学方程式为               

(3)肼可作为火箭发动机的燃料,与氧化剂N2O4反应生成N2和水蒸气。

已知:①N2(g)+2O2(g)= N2O4 (1)          △H1= -19.5kJ·mol-1 

②N2H4 (1) + O2(g)= N2(g) + 2 H2O(g)      △H2= -534.2kJ·mol-1

写出肼和N2O4反应的热化学方程式                             

(4)肼一空气燃料电池是一种碱性电池,该电池放电时,负极的反应式为                

考点:单质磷及其化合物氮气二氧化氮
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男性,60岁,慢性咳嗽、咳痰12年,活动后气急3年。胸片示肋间隙增宽,双肺透亮度增加,双下肺纹理紊乱。最可能的诊断是

A.支气管扩张

B.慢性支气管炎

C.慢性支气管炎、肺气肿

D.机化性肺炎

题型:填空题
Jennie sat at her window as usual, looking out upon the street, with a look of sadness on her face, “What a long day this is going to be!”
Then she saw a little boy running down the street, swinging his schoolbag. Looking up to the window, he took off ____11____ hat and bowed with a bright, pleasant smile.
“What a nice ____12____,” said Jennie to herself, as the boy ran out of sight. “It seems like having the sunshine. I wish everybody who goes by would look up ____13____ smile.
George, the little boy, told his mother about that ____14____ girl when he got back home, “She looks so helpless. I wish I could do something for her.”
“Why not give her some ____15____?” said his mother. George agreed.
The next morning, as Jennie ____16___ at the window again, she saw George with a handful of beautiful flowers carefully picking his way across the street. He stopped in front of her window, smiling pleasantly, and said, “Can I come in?” Jennie told him _____17____ to get into the house.
Opening the door to Jennie’s gentle “Come in”, George said, “I’ve brought you some flowers.”
“Are they for me?” said Jennie ____18____. “How kind you are,” she continued, as George put the flowers on her lap. I’ve ____19___ received any flower since we moved to the town.”
“Did you live in the countryside?” asked George, ___20____ the old, small and empty room.
“Yes,” said Jennie.
Jennie used to have a happy family and live in a beautiful house in the countryside. However, she lost her right leg in an accident. She ____21____ walk like other people any longer. Later, her father died, and her mother was sick ___22____ so many years that their money was all gone. They sold the house, and move here to get work to do.
George told his parents ____23____. They decided to help her. More and more people in the ____24___ gave Jennie friendly smiles when they passed by her house. She was greatly cheered up.
A few months later, Jennie and her mother ____25____ a flower shop. People could always see Jennie sitting in the shop, having a lovely smile on face.
小题1:
A.herB.hisC.yourD.my
小题2:
A.houseB.doorC.smileD.schoolbag
小题3:
A.andB.butC.asD.or
小题4:
A.richB.luckyC.badD.poor
小题5:
A.moneyB.flowersC.clothesD.food
小题6:
A.dancedB.criedC.satD.laughed
小题7:
A.howB.whoC.whenD.why
小题8:
A.angrilyB.easilyC.sadlyD.happily
小题9:
A.neverB.usuallyC.alwaysD.sometimes
小题10:
A.looking forB.looking aroundC.looking likeD.looking after
小题11:
A.shouldn’tB.needn’tC.couldn’tD.mustn’t
小题12:
A.forB.inC.atD.on
小题13:
A.somethingB.anythingC.everythingD.nothing
小题14:
A.countrysideB.townC.villageD.city
小题15:
A.reachedB.leftC.closedD.opened
题型:填空题

细菌鞭毛起源于细菌细胞何处?有何功用?细菌鞭毛由哪几部分构成?具有鞭毛的细菌主要有哪些类群?

题型:填空题

山岭隧道的结构防排水施工中,衬砌的( )应采用橡胶止水带或塑料止水带防水,其止水带不得被钉子、钢筋和石子刺破。

A.沉降缝

B.施工缝

C.伸缩缝

D.引水管

E.泄水孔

题型:填空题

班组设备维护保养应贯彻“()为主,维修与计划检修并重”的原则。

A.大修

B.小修

C.更换

D.预防

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