设nA为阿伏加德罗常数的数值,下列说法正确的是( ) A.16gCH4含有10n

题型:选择题

问题:

设nA为阿伏加德罗常数的数值,下列说法正确的是(  )

A.16g CH4含有10nA个电子

B.常温常压下,22.4L Cl2含有2nA个Cl原子

C.1 mol Cu与足量稀HNO3反应,转移3nA个电子

D.1L O.1 mol.L-1 Na2SO3 溶液中含有 O.1nA个S032-

考点:阿伏加德罗常数
题型:选择题

以下说法哪一个是正确的

A.服务器只能用64位的CPU芯片制成

B.服务器不能用32位的CPU芯片制成

C.大型机可以用作服务器

D.微型机不可以用作服务器

题型:选择题

下列说法正确的是 [     ]

A.摩尔质量就等于物质的式量

B.摩尔质量是物质式量的6.02×1023

C.HNO3的摩尔质量是63g

D.氧化铜和三氧化硫的摩尔质量相等

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"Everything happens for the best, "my mother said whenever I faced disappointment, "If you 36 on, something good will happen some day."
Mother was right, as I discovered after graduating from college. I had   37  myself for a sports announcer. So I went to Chicago to knock on the door of every station and was 38  every time. In one station, a kind lady told me that 39  stations wouldn't employ a person without   40 since I had just graduated. "Go out in the town and find a small station that might give you a chance, "she said.
I returned to Dixon, where I had finished my high school education and had  41  in the school football team. My father said that our town had built a store and wanted a man to manage its sports department. The job sounded just 42   for me but I wasn't hired.
My disappointment had 43  as if by design. "Everything happens for the best," Mum  44  me. Dad lent me his car to look for a job. I tried WOC Radio Davenport. The program director told me they had already hired an announcer.  45 I left his office, I asked aloud,"  46 can a fellow get to be a sports announcer if he can't get a job in a radio station?" Suddenly, I heard the director  47  . "Do you know anything about football? " Then he asked me to 48  an imaginary game. It was easy, and I did it without difficulty. The director was 49  and told me I would be broadcasting a game on the   50  Saturday.
小题1:
A.put B.take C.moveD.carry
小题2:
A.devoted B.designed C.found D.enjoyed
小题3:
A.invited B.promisedC.refusedD.accepted
小题4:
A.largeB.all C.no D.small
小题5:
A.experienceB.examinationC.agreementD.college
小题6:
A.played B.joinedC.taken D.fought
小题7:
A.possibleB.successfulC.right D.important
小题8:
A.shownB.disappearedC.resultedD.turned
小题9:
A.woke B.advisedC.demandedD.reminded
小题10:
A.WhileB.AfterC.BeforeD.So
小题11:
A.WhatB.How C.WheneverD.Wherever
小题12:
A.calling B.answering C.broadcastingD.announcing
小题13:
A.make B.actC.broadcast D.play
小题14:
A.moved B.sorryC.thankfulD.satisfied
小题15:
A.future B.coming C.last D.later
题型:选择题

下列说法中正确的是[ ]

A.非金属元素呈现的最高化合价不超过该元素原子的最外层电子数

B.非金属元素呈现的最低化合价,其绝对值等于该元素原子的最外层电子数

C.最外层有2个电子的原子都是金属原子

D.最外层有5个电子的原子都是非金属原子

题型:选择题

挫伤的形成是由于()。

A、致伤物坚硬

B、致伤物不太坚硬

C、致伤物作用面较窄

D、软组织较薄

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