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【单选题】
等式 (4-x) 2 (6-x) =（x-4） 6-x 成立的条件是（ ）A.
x≥4
B.
4≤x≤6
C.
x≥6
D.
x≤4或x≥6
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【单选题】The electron configuration of a neutral atom is 1s 2 2s 2 2p 6 3 s 2 3p 6 4 s 2 , t he element is
A.
K
B.
Ca
C.
Sc
D.
Mn
【单选题】What is the primary purpose of PepsiCo ’ s s ustainable a griculture s upport p olicy ?
A.
T o secure their supply chain into the future;
B.
To fulfill the company ’ s social responsibility;
C.
To gain good reputation for the company;
【单选题】The number of "Quayle in 96" buttons demanded on a certain university campus is given by D(p) = 100-p; where p is the price of buttons measured in pennies. The supply function is S(p) = p. The current...
A.
an increase of $5.50.
B.
an increase of $3.50.
C.
no change
D.
a decrease of $3.50.
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