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【简答题】
如图所示，平行单色光垂直照射到某薄膜上，经上下两表面反射的两发生干涉，设薄膜厚度为e，n 1 >n 2 ，n 2 < n 3 ，入射光在折射率为n 1 的媒质中波长为λ，试计算两反射光在上表面相遇时的位相差.
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【简答题】创建一个存储过程,求1+2+3+...+n
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A.
They usually hold savings accounts.
B.
They have current accounts.
C.
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D.
They deal in short-term savings accounts.
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A.
the principal and interest until the end of the loan period
B.
the principal and interest at the end of the loan period
C.
the loan in a series of installments
D.
at any time when cash is more abundant ______.
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A.
error term
B.
parameter
C.
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D.
dependent variable
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A.
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B.
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C.
Migration brings about desirable and undesirable effects.
D.
Migration may not be accompanied by human conflicts.
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