1、若直线x+ay+2=0和直线2x+3y+1=0互相垂直,则a=( ).(单选题)
A.
B.
C.
D.
试题答案:A
2、设f(x)=(1+x)+(1+x) 2+……+(1+x) n,在f(x)中x 2的系数T n,则 ( ).(单选题)
A.
B.
C. 1
D. 2
试题答案:B
3、下面物质中既能从溶液中制取也能用游离元素直接合成的是( ).(单选题)
A. FeS
B. CuS
C.
D. H2SO4
试题答案:A
4、关于x的不等式x2-2ax-8a2<0(a>0)的解集为(x1,x2),且x2-x1=15,则A等于( ).(单选题)
A.
B.
C.
D.
试题答案:A
5、There’s one thing I dislike about him: he will never admit _____ a mistake.(单选题)
A. having made
B. making
C. being made
D. have been made
试题答案:A
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