题目内容
(请给出正确答案)
[单选题]
Many species of animals which once lived on the earth_____no longer in existence.
A.is
B.are
C.was
D.were
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A.is
B.are
C.was
D.were
在PUBMED数据库中要查看某个检索结果的临床试验(ClinicalTrial)方面的文献,应该在哪项过滤功能中查找()
A、Text availability
B、Subjects
C、Species
D、Articletypes
E、Text availability
A.credit
B.cost
C.card
D.call
A.larger than
B.more than
C.as great as
D.as many as
A.on
B.under
C.in
D.at
How many flip-flop circuits are needed to divide by 16? (Intel) 16分频?