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【单选题】
从下列哪类动物开始出现上下颌A.
圆口类
B.
爬行类
C.
两栖类
D.
鱼类
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举一反三
【简答题】设某商品的需求量D对价格p的需求函数为D=50- ，则需求价格弹性函数为( )
【单选题】To avoid scavenge fires _____ the engine timing and equipment maintenance should be correctly carried out.
A.
occurred
B.
occurring
C.
not happening
D.
occur
【单选题】The primary purpose of the passage as a whole is to______
A.
question an explanation
B.
correct a misconception
C.
critique a methodology
D.
discredit an idea
E.
clarify an ambiguity
【简答题】某商品的需求函数为 ,则 时的需求弹性为 。
【单选题】The professor has finished ______ the students' papers.
A.
to correct
B.
in correcting
C.
correcting
D.
being corrected
【简答题】某函数的需求函数为 ,则需求弹性函数为 ,当 时的需求弹性是 .
【单选题】Marine B(s)/L perform. a number of functions, which of the following is not correct? （ ）
A.
evidence of the contract of carriage
B.
receipt for the goods shipped
C.
document of title to the goods
D.
non-negotiable document
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