337、
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443、
A. a>0,b>0,c>0,d<0
B. a>0,b0
C. a>0,b0,d>0
D. a0
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375、直线xcosa-y+1=0的倾斜角的取值范围是( )
A. [兀/4,3兀/4]
B. [0,兀/4][3兀/4,兀]
C. (0,兀)
D. [0.兀/2]
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525、
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448、
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82、
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2为实数),则入1+入2的值为()
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6、设全集U={-2,-1,0,1,2}集合A={0,1,2},B={-1,2},则A∩(CUB)=()
A. {O,1}
B. {0,1,2}
C. {-1,1,2}
D. {O,-1,1,2}
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227、将函数y=2sin(2x+π/6)的图象向右平移 1/4 一个周期
A. 所得图象对应的函数为()
B. =2sin(2x-π/4)
C. y=2sin(2x+π/3)
D. y=2sin(2x-π/3)
E. y=2sin(2x+π/4)
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321、已知集合 A ={-1,0,1,2}, B ={x|x,1},则A∩B=()
A. .{0,1,2}
B. .{0,1}
C. .{-1,0,1}
D. .{-1,1}
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