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【简答题】
已知函数f（x）=cos 4 x-2sinxcosx-sin 4 x。 （1）求f（x）的最周期； （2）求f（x）的最大值、最小值。
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皮皮学刷刷变学霸
举一反三
【单选题】已知在温度 T 时,反应1/2 C ( s ) +1/2CO 2 ( g )= CO ( g )的平衡常数为 K 1 ,则反应方程式书写为: C ( s ) +CO 2 ( g ) = 2CO ( g )时,其平衡常数 K 2 =
A.
2K
B.
K
C.
K 2
D.
1/2K
【单选题】已知在温度 T 时,反应 的平衡常数为 K 1 ,则反应方程式书写为: C ( s ) +CO 2 =( g ) 2CO ( g )时,其平衡常数 K 2 = ( )
A.
2 K
B.
. K
C.
K 2
【简答题】请把实例书P55-56的习题2做在《计算机病毒》后面
【单选题】已知在温度T时,反应1/2C(s)+1/2CO 2 (g)=CO(g)的平衡常数为K 1 ,若反应方程式书写为C(s)+CO 2 (g)=2CO(g)时,其平衡常数K 2 =( )。
A.
2K1
B.
K1
C.
K 2 1
D.
1/2K1
【单选题】What does "For all you say,I think she is the best teacher we've got" mean?
A.
Because of all you say, I think she is the best teacher we've got
B.
I want to tell all of you that she is the best teacher we've got
C.
Despite all you say, I think she is the best teacher we've got
D.
I think she is the best teacher we've got for all of you who are speaking
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