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【单选题】
锗测量的某γ射线的峰面积计数是一百万,则其统计涨落是( )。A.
1％
B.
0.1％
C.
10%
D.
0.33％
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【简答题】When we think about happiness, we usually think of something extraordinary, a pinnacle(顶点) of sheer(纯粹的) delight. And those pinnacles seem to get rarer the older we get. 小题1: I remember playing police...
【单选题】听力原文： When we think about happiness, we usually think of something extraordinary, a feeling of sheer delight, and those feelings seem to get rarer the older we get. For a child, happiness has a magica...
A.
Happiness at different stages of life.
B.
The concept of happiness.
C.
Experiences of all kinds of happiness.
D.
How to find happiness.
【简答题】某1000m 3 高炉，利用系数为2.45，生产1t生铁消耗干料（kg/t）：焦比474.2、煤比66.8，烧结矿1690，澳矿116.6，石灰石24.5；生铁成分（%）：Fe—94.56，C—4.50，Si—0.52，Mn—0.29，P—0.10，S—0.03；炉顶煤气成分（%，体积分数）：CO—23.70、CO 2 —18.18、N 2 —56.32、CH 4 —0.6、H 2 —1.2；大气...
【简答题】化肥厂生产合成氨的原料是煤、空气、水。生产简要流程如下： 煤气发生炉中主要反应：①C + O 2 = CO 2 ；②C + H 2 O =' CO' + H 2 。两个反应必须进行调控才能保持一定的炉温。判断：反应②____ ____（填“放出”或“吸收”）热量。 将合成的氨气部分通入碳化塔，既除去了二氧化碳又得到了化肥NH 4 HCO 3 ，试写出该反应的化学方程式____ ____。
【简答题】（本小题满分13分，（Ⅰ）小问8分，（Ⅱ）小问5分.） 在每道单项选择题给出的4个备选答案中，只有一个是正确的.若对4道选择题中的每一道都任意选定一个答案，求这4道题中： （Ⅰ）恰有两道题答对的概率； （Ⅱ）至少答对一道题的概率。
【单选题】When we think about happiness, we usually think of something extraordinary--and those pinnacles of sheer delight--and those pinnacles seem to get rarer the older we get. For a child, happiness has a m...
A.
They may get happiness from games.
B.
They may feel happy if they get a role in a school play.
C.
They feel happy all the time.
D.
An ordinary event may put them at a pinnacle of sheer delight.
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