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【多选题】
G 的换位子群为 C, 则下列说法正确的是A.
C 是 G 的不变子群
B.
G/C 是交换群
C.
C 是使得可交换的最小子群
D.
C 必定是循环群
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【简答题】For one reason or another, all countries impose trade barriers on certain goods crossing their borders.
【单选题】Another reason why small countries are less involved in high-tech markets is that ______.
A.
laziness
B.
less creativity
C.
the transportation costs of low-tech products
【单选题】The reason_______ so many people rushed to California was ______ another gold mine was found in California.
A.
that; because
B.
why; that
C.
that; why
D.
why; because
【简答题】我国第一家中外合资基金公司诞生于（ ）年年末。
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