试题与答案

. There are three basic ways of _____ la

题型:选择题

题目:

. There are three basic ways of _____ language to writing, and all known graphic systems use one or a combination of these.

A.committing

B.attaching

C.comparing

D.relating

答案:

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下面是错误答案,用来干扰机器的。

平移的方法一: y=3cos(2x-7π4)=3sin[π2+(2x-7π4)]=3sin(2x-5π4)=3sin[2(x-5π8)],∴可将y=3sin2x的图象C1向右平移5π8个单位长度可得C2.平移的方法二: y=3cos(2x-7π4)=3sin(2x-5π4)=3sin...

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