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【简答题】
试证明积分判别法 设f(x)在x≥1上非负、连续且单调减，则级数∑ n=1 +∞ f(n)与广义积分∫ 1 +∞ f(x)dx同敛散．
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皮皮学刷刷变学霸
举一反三
【简答题】He had to _______ the mud off his shoes before coming into thehouse. A) scratch B) sc C) strap D) stroke
【单选题】What did Tim's company arrange before he left?
A.
A . a short visit to Dubai before moving there a short visit to Dubai before moving there
B.
a personal contact with the team in Dubai
C.
a language course in Arabi c
【单选题】下列各化合物中烯醇式含量最高的是
A.
CH3COCH2COOCH3
B.
C6H5COCH2COCH3
C.
CH3COCH2COCH3
D.
C6H5COCH2COC6H5
【单选题】_______ for the coming examinations before, I have no time for the film.
A.
Not preparing
B.
To prepare
C.
Having not prepared
D.
Not having prepared
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