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【判断题】
CNKI中的中国优秀博硕士学位论文全文数据库和万方中国学位论文全文数据库都提供了“分类号”检索入口。( )A.
正确
B.
错误
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举一反三
【判断题】设函数 y=f ( x ) 的反函数为 x=g ( y ) ,若 x=g ( y ) 在点 y = y 0 处可导,则 y=f ( x ) 在对应点 x = x 0 =g( y 0 ) 也可导。
A.
正确
B.
错误
【简答题】My name is David. There are many things in my room. There is a sweater 31 the bed. It’s 32 . I also have a pair（双）of 33 . They are blue, too. There is a desk and a chair in 34 room. A football is unde...
【简答题】There are many kinds of friends. Some are always 36 you , but don't understand you. Many people will step in your life, but only 37 friends leave footprints. (脚印). I shall always remember the girl wit...
【多选题】若函数f(x)在点x处可导,g(x)在点x处不可导,则下列结论正确的有:
A.
f(x)+g(x)在点x可能可导可能不可导
B.
f(x)*g(x)在点x处可能可导可能不可导
C.
Cf(x)在点x处一定可导，其中C为常数
D.
Cg(x)在点x处一定不可导，其中C为常数
【单选题】Sound personal health choice is often difficult to make because____.
A.
current medical knowledge is still insufficient
B.
there are many factors influencing our decisions
C.
few people are willing to trade the quality of life for longevity
D.
people are usually influenced by the behavior of their friends
【简答题】Books are our greatest friends. They 31 us stories of every country in the world. They give us all kinds of 32 . Life is short. One can not know and see 33 in the world. 34- the help of books, one is ...
【简答题】已知函数f（x）是在（0，+∞）上每一点处可导的函数，若xf′（x）＞f（x）在（0，+∞）上恒成立． （Ⅰ）求证：函数g（x）= f(x) x 在（0，+∞）上单调递增； （Ⅱ）当x 1 ＞0，x 2 ＞0时，证明：f（x 1 ）+f（x 2 ）＜f（x 1 +x 2 ）； （Ⅲ）已知不等式ln（1+x）＜x在x＞-1且x≠0时恒成立，证明： 1 2 2 ln2 2 + 1 3 2 ln3 2 ...
【简答题】The heaviest snow in a hundred years hit the south of China. It snowed __ 36_ __for half a month. Many people were __37___in railway stations, bus stations and airports. People did everything they cou...
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