二氧化硫与氧气的反应为:2SO2(g)+ O2(g) 2 SO3 (g); △H

题型:选择题

问题:

二氧化硫与氧气的反应为:2SO2(g)+ O2(g) 2 SO3 (g); △H <0, 该反应在硫酸工业生产中应采取的适宜条件是(    )

A.低温、高压、催化剂

B.适宜的温度、高压、催化剂

C.低温、常压、催化剂

D.适宜的温度、常压、催化剂

考点:化学平衡的有关计算影响化学平衡的因素达到化学平衡的标志化学平衡常数
题型:选择题

自柯达推出第一代透明摄影胶卷,100多年来凭借其优质摄影器材、相纸和胶卷,一度叱诧风云。但自数码摄影急速发展之后,它落入朝不保夕的境地。这警示我们 [ ]

①信誉是企业生存发展无形资本

②辩证否定要求紧跟时代

③调整经营策略是企业发展要求

④成功与失败乃一念之间

A.①②

B.①③

C.②③

D.②④

题型:选择题

静息状态下心血池显像时正常人心室轴缩短率应该是

A.大于>75%

B.大于>65%

C.大于>45%

D.大于>35%

E.大于>25%

题型:选择题

口服铁剂宜在__________或__________服用,可减少胃肠道不适应,避免与________、________、____________同时服用。

题型:选择题

脑干也是脑的组成部分,其中有专门调节______、______、______等人体基本生命活动的部位.

题型:选择题
When it comes to friends, people always know this old saying——A friend in need is a friend indeed. The best friend a man has in the world may    him and become his enemy. His son or daughter that he has       with loving care may prove ungrateful. Those who are nearest and dearest to us, those whom we trust with our happiness and our good reputation, may         our faith. A man may        the money he has. It flies away from him, perhaps when he needs it most. A man’s reputation may be sacrificed in a moment of ill-considered action. The people who are ready to fall on their knees to do us        when success is with us may be the first to throw the stone of hatred when        settles its cloud upon our heads. The one        unselfish friend that man can have in this selfish world, the one that never        him, the one that never proves         or distrusted, is his dog.
A man’s dog stands by him in richness and in        , in health and in sickness. He will sleep on the cold ground, where the cold wind blow and the snow drives fiercely, if only he may be near his        side. He will kiss the hand that has no food to         ; he will lick the wounds and sores that come from encounter with the roughness of the world. He will guard the sleep of his master        he were a prince. When all other friends desert, he        . When wealth and reputation fall to pieces, he is as constant in his love as the sun in its journeys through the heavens.
If fortune drives the master forth, a deserted person in the world, friendless and homeless, the faithful dog asks no higher privilege than that of         him, to guard him against danger, to fight against his         . And when the last         of all comes, and death takes the master in its embrace, and his body is         in the cold ground, no matter if all other friends         their ways, there by the grave will the          dog be found, his head between his paws, his eyes sad but open in alert watchfulness, faithful and true even in death.
小题1:
A.turn to B.submit to C.turn against D.look up
小题2:
A.brought upB.come up C.grown up D.catch up
小题3:
A.restore B.betray C.keep D.strengthen
小题4:
A.gain B.lose C.earn D.donate
小题5:
A.honor B.favorC.credit D.good
小题6:
A.shadowB.successC.failureD.depression
小题7:
A.accuratelyB.deliberatelyC.equallyD.absolutely
小题8:
A.appreciatesB.envies C.admiresD.deserts
小题9:
A.ungratefulB.unfortunate C.faithful D.considerate
小题10:
A.povertyB.progress C.welfareD.wealth
小题11:
A.host’s B.master’s C.landlord’sD.chief’s
小题12:
A.serveB.fetch C.offerD.order
小题13:
A.only ifB.in case C.even ifD.as if
小题14:
A.fleesB.remainsC.ignoresD.persists
小题15:
A.servingB.protectingC.spoilingD.accompanying
小题16:
A.enemiesB.masters C.friendsD.acquaintances
小题17:
A.sightB.sceneryC.scene D.view
小题18:
A.buried B.hungC.thrownD.laid
小题19:
A.forceB.loseC.pursue D.find
小题20:
A.meanB.generalC.selfishD.Noble
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