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【单选题】
测量某一量值，其结果为: 10. 5 , 10. 7 , 10. 3 ，求其A类标准不确定度为( )。(其中n =2时，极差系数C= 1.13;n=3 时，极差系数C= 1.69;n =4 时，极差系数C =2.060)A.
0.35
B.
0.12
C.
0.19
D.
0.24
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New Zealander
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at
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in
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for
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since
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【简答题】阅读理解 Over thirty thousand years ago people from northern Asia went to America. Today, we call these people Indians(印第安人). The Indians went to America because the weather began to change. Northern Asia...
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