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【单选题】
指南针是我国古代的四大发明之一,下列有关指南针和地磁场的说法中正确是( )A.
指南针静止时南极指向地理北极
B.
如果地磁场消失，指南针还能指示南北
C.
指南针静止时指示南北，是因为受到地磁场的作用
D.
由于地磁场的存在，所以在地球的周围才存在着磁感线
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【简答题】已知 为常数， ，在区间 上的最大值是2，则
【简答题】已知 其中 为常数，若 ，则 =
【简答题】已知a,b为常数，若 则 .
【单选题】'What's in a name? That which we call a rose By any other name would smell as sweet So Romeo would, were he not Romeo called' (Romeo and Juliet, Act 2, Scene 2,43-45) To what characteristics of langua...
A.
Creativity.
B.
Productivity.
C.
Duality.
D.
Arbitrariness.
【简答题】已知 ，其中 、 为常数，且 ，若 为常数，则 的值为 .
【单选题】Chinese people place a person’s family name before the given name, _______ people in many other countries do the opposite.
A.
but
B.
and
C.
however
D.
while
【单选题】The difference between the name of a service company and those of other companies is that
A.
the products are tangible but services are not.
B.
the name of a service company is a company's image but the names of other companies are not.
C.
customers are loyal to brand names of products but are not to names of services.
D.
brand names can help service companies to expand their business but cannot help other companies in this aspect.
【简答题】已知 为常数，函数 在区间 上的最大值为 ，则实数 的值为_____________．
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