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【判断题】
CCD光电耦合器件能将照射在其上面的光能转换成电荷A.
正确
B.
错误
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举一反三
【简答题】幼儿园教育是_______ 的重要组成部分，是我国学校教育和终身教育的奠基阶段。
【单选题】How many colleges and students are there in Canada?
A.
350600,000
B.
3606,000,000
C.
370600,000
D.
3806,000,000
【单选题】How many Americans are there in colleges and universities?
A.
About seven million.
B.
Half of the American population.
C.
25% of American people.
D.
About 25 million.
【单选题】能用于沉淀滴定法进行定量分析的化学反应,不需具备的条件是:
A.
沉淀反应必须迅速、定量地完成
B.
反应生成沉淀的溶解度必须很小
C.
有适当的方法确定滴定终点
D.
指示剂用量越多越好
E.
沉淀的吸附现象应不妨碍化学计量点的确定
【单选题】How many Americans are there in colleges and universities?
A.
About seven million.
B.
Nearly half of the American population.
C.
Young persons under twenty-five.
【单选题】How many African-American students earned their degrees in California community colleges according to a recent review?
A.
Fifty-six percent.
B.
Thirty-nine percent.
C.
Fifteen percent.
D.
Sixty-seven percent.
【多选题】能用于沉淀滴定法的化学反应必须具备的条件是( )
A.
沉淀的溶解度必须很小
B.
有适当的方法确定滴定终点
C.
沉淀反应必须迅速定量完成
D.
必须在酸性条件下
E.
沉淀的吸附现象不能影响滴定终点的确定
【单选题】According to the report, how many casualties by {ar are directly due to the radiation?
A.
about 4,000
B.
about tens of thousands
C.
about 50
D.
about 350,000
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