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【简答题】
求函数 的导数，其中a与m为不的常数．
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【单选题】The hostess attempted to __________ a romantic atmosphere in her 10th marriage anniversary.
A.
strive
B.
contrive
C.
conceive
D.
retrieve
【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, _____ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons .
A.
gases
B.
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【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, ______ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons.
A.
substances
B.
elements
C.
gases
D.
air
【简答题】Read the following passage and translate it into Chinese. The nitrogen cycle consists of a sequence of biochemical changes wherein nitrogen is used by living organisms, transformed upon death and deco...
【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, _____ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons .
A.
gases
B.
elements
C.
air
D.
substances
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