电解36g水,在标准状况下可以生成氢气和氧气的体积比为( ) A.2:1 B.3

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问题:

电解36g水,在标准状况下可以生成氢气和氧气的体积比为(  )

A.2:1

B.3:1

C.1:0.5

D.2:3

考点:电解水实验化学反应方程式的计算
题型:选择题

产品破坏前的临界加速度通常以重力加速度的倍数表示。

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下图是一正弦交变电流的电流图象.此正弦交变电流的频率和电流的有效值分别为(  )

A.5Hz,10A

B.50Hz,10A

C.50Hz,10 A

D.5Hz,10 A

题型:选择题
About one year ago, a couple with three children moved into the apartment next door to me. I never heard any noise from the children. Instead, I often heard the parents yelling   __26__   at the kids, not in a nice tone, but in a   __27__  one.
We often   __28__  in the hallway. I always greeted them, but the only __29__   I ever got was a “hello” from the eight­year­old girl. I usually   __30__   to see my doctor and one day when I returned they were just   __31__   their apartment and the little girl was   __32__   the outside door open for the others. I   __33__   in the car doing   __34__   things because I wasn't eager to be snubbed(冷落) again. Finally, I got out of my car and walked towards the door. The parents were telling their daughter to hurry and get into the car,   __35__   the little girl was still holding the door,  __36__   me! I hurried although I was still in pain from my injury.
I forgot to tell her how  __37__   I was for her kindness. I wrote a note saying how much her act of kindness had   __38__ an old man's heart.
The next day there was a   __39__   on my door and it was the little girl and her father. She was quite   __40__   of her behavior and thanked me. Then I noticed her mother standing there too. Her parents  __41__   me.
From then on when we met in the hallway we always greeted each other,in a friendly   __42__.
Last night there was a heavy snow. I looked out at my car and   __43__   how I was going to keep my doctor's   __44__   because I could only walk for a short time. This morning when I opened the front door, all the snow was removed.
Isn't it  __45__   that the small kind act of an 8­year­old girl can change so many things for the better? It is said that good things come from small acts.
小题1:
A.quietlyB.strangelyC.quicklyD.angrily
小题2:
A.frighteningB.excitingC.sincereD.kind
小题3:
A.quarreledB.metC.chattedD.argued
小题4:
A.presentB.resultC.replyD.return
小题5:
A.went outB.set outC.took outD.gave out
小题6:
A.decoratingB.cleaningC.returningD.leaving
小题7:
A.breakingB.operatingC.holdingD.unlocking
小题8:
A.keptB.remainedC.insistedD.continued
小题9:
A.favoriteB.irrelevantC.unnecessaryD.curious
小题10:
A.butB.andC.soD.then
小题11:
A.hunting forB.asking forC.waiting forD.calling for
小题12:
A.beneficialB.influentialC.anxiousD.grateful
小题13:
A.strengthened B.brokenC.touchedD.saved
小题14:
A.noteB.knockC.invitationD.picture
小题15:
A.proudB.awareC.afraidD.sure
小题16:
A.admittedB.recognizedC.praisedD.thanked
小题17:
A.mannerB.appearanceC.soundD.announcement
小题18:
A.foundB.ignoredC.rememberedD.wondered
小题19:
A.promiseB.appointmentC.suggestion D.attention
小题20:
A.amazingB.confusingC.scaringD.challenging
题型:选择题

刮涂感光乳剂()

A.只涂刮印面

B.涂被印物接触面

C.依印纹决定刮涂面

D.两面皆需刮涂感光乳剂

题型:选择题

焊环活动法兰多用于管壁比较厚的( )法兰的连接。

A.铜管

B.铅管

C.不锈钢管

D.无缝钢管

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