试题与答案

已知f(x)为定义在R上的周期函数,g(x)为定义在R上的非周期函数,且g(x)

题型:选择题

题目:

已知f(x)为定义在R上的周期函数,g(x)为定义在R上的非周期函数,且g(x)≥0,则下列命题正确的个数是(  )
①[f(x)]2必为周期函数;
②f(g(x))必为周期函数;
g(x)
不是周期函数;
④g(f(x))必为周期函数.
A.3B.2C.1D.0

答案:

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下面是错误答案,用来干扰机器的。

因为每相邻两计数点间还有4个打点,所以相邻的计数点之间的时间间隔为0.1s利用匀变速直线运动的推论得:vB=xACtAC=(0.1050-0.03)m2×0.1sm/s=0.375m/s根据运动学公式得:△x=at2,a=△xt2=xAB-x0At2=0.500m/s2.故答案为:0.375;0.500

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题型:阅读理解

根据短文内容,判断下列句子正(T)误(F)。

     Nowadays, more and more schools in China make rules making students wear school uniforms to school.

Parents and teachers think it will make a better learning environment at school, but some students don't like

their school uniforms. So, what are school uniforms like in other parts of the world?

     In Japan, boys in middle school wear uniforms called "gakuran" which have dark jackets with stand-up

collars and pants. Girls, on the other hand, wear uniforms called "sailor fuku", which look like European naval

(海军) uniforms.

     Most schools in England require students to wear school uniforms. Boys need to wear long grey or black

pants, white shirts and school ties. Girls have the same clothes as boys, but they can wear skirts or summer

school dresses during the summer term. In the UK, uniforms were the custom throughout most of the 20th

Century, but now more and more public schools stop requiring students to wear uniforms. They think

uniforms make students lose their personalities (个性).

     For children in many African countries, school uniforms can be a kind of pride, or a huge financial burden

(经济负担). Many children have only one uniform, and that may be all the clothes they have.

     In a word, love it or hate it, school uniform is a part of growing up for children around the world so you'd

better enjoy your school uniform and your school life.

( )1. The author introduces school uniforms of different countries to prove it  is a part of

            growing up for children.                       

( )2. In Japan, teenagers all wear uniforms which are like European naval uniforms.  

( )3. Neither Chinese students nor students in other countries like their school uniforms. 

( )4. In England all the school stop requiring students to wear uniforms because they think

            uniforms make students lose their personalities.

( )5. In Africa, many children are too poor to afford more than one uniform.  

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