15 Countries most likely establish export restrictions to ________.
A.
ensure their population obtains the goods first
B.
raise prices in foreign markets
C.
encourage substitute products
D.
reduce domestic production
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【简答题】A. r (Na)> r (Mg)> r (Al)> r (K) B. r (K + )> r (Ca 2 + )> r (S 2 - )> r (Cl - ) C. r (Na)> r (K)> r (Ca)> r (Mg) D. r (F - )> r (Na + )> r (Mg 2 + )> r (Al 3 + )