循环水预膜的目的是用()在洁净的金属管道和光滑的换热器内表面上预先生成一层薄而致密的

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问题:

循环水预膜的目的是用()在洁净的金属管道和光滑的换热器内表面上预先生成一层薄而致密的保护膜。

考点:石油化工设备知识考试石油化工设备知识考试题库
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数据模型分为格式化模型与非格式化模型,层次模型与网状模型属于______。

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今年三月我市城区三名中学生因食用街头地摊盒饭引起中毒而致生命危险.经卫生防疫部门检验,该食物中毒系“毒鼠强”所为,它的化学式为C4H8N4S2O4,由此可知“毒鼠强”是由 ______元素组成的化合物,其相对分子质量为 ______.

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It was an early morning in summer. In the streets, sleepy-eyed people were moving quickly, heading towards their    . This was the beginning of another      day in New York City.      this day was to be different.
Waiting     the crowded streets, on top of a       110 stories high, was Philippe Petit. This daring Frenchman was about to     a tightrope (绷索) between the two towers of the World Trade Center.
Philippe took his first      with great care.  The wire held. Now he was     he could do it.     only a balancing pole, Philippe walked his way across, a      of 131 feet.
 Soon the rush-hour     began to notice. What a      ! There, 131 feet above the street, a      figure was walking on air.
 Philippe made seven      , back and forth (来回). He wasn't satisfied with just      . At times, he would turn, sit down, and     go on his knees. Once, he had the astonishing     to lie down on the thin thread. And thousands of      watchers stared with their hearts beating fast.
 After the forty-five-minute     , Philippe was taken to the police station.  He was asked     he did it. Philippe shrugged (耸肩) and said, "When I see two tall buildings, I walk."
小题1:
A.jobsB.homesC.busesD.offices
小题2:
A.workingB.hotC.sameD.ordinary
小题3:
A.AndB.SoC.ButD.Thus
小题4:
A.forB.inC.byD.above
小题5:
A.roofB.positionC.wallD.building
小题6:
A.throwB.walkC.climbD.fix
小题7:
A.actB.landingC.stepD.trip
小题8:
A.sureB.uncertainC.gladD.nervous
小题9:
A.ThroughB.AgainstC.WithD.On
小题10:
A.distanceB.heightC.spaceD.rope
小题11:
A.streetsB.crowdsC.passengersD.city
小题12:
A.heightB.pleasureC.wonderD.danger
小题13:
A.greatB.strangeC.publicD.tiny
小题14:
A.experimentsB.circlesC.tripsD.movements
小题15:
A.walkingB.stayingC.actingD.showing
小题16:
A.almostB.evenC.oftenD.rather
小题17:
A.spiritB.resultC.strengthD.courage
小题18:
A.patientB.terrifiedC.pleasedD.enjoyable
小题19:
A.showB.trickC.tryD.program
小题20:
A.howB.whyC.whetherD.when
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淬火时,在水中加入(),可增加在650℃—550℃范围内的冷却速度,避免产生软点。

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土地转让的发包方和承包方应当订立承包合同,约定双方的权利和义务。土地承包经营的期限为( )。

A.10年

B.20年

C.30年

D.由承包合同约定

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