It is the third time that she has won the race, _______ has surprised us all.
A. that
B. where
C. which
D. what
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After the flooding, people were suffering in that area, ______ urgently needed clean water, medicine and shelter to survive.
A. which
B. who
C. where
D. what
Between the two parts of the concert is an interval, _______ the audience can buy ice-cream.
A. when
B. where
C. that
D. which
在( )中,补元是唯一的。
A. 有界格
B. 有补格
C. 分配格
D. 有补分配格
设集合S={1,2,3,6},“≤”为整除关系,则代数系统< S , ≤ >是( )
A. 域
B.格,但不是布尔代数
C.布尔代数
D.不是代数系统
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