A:hold
B:holding
C:held
D:to be held
直线y=kx+3与圆x-32+y-22=4相交于M,N两点,若MN≥23,则k的取值范围是( )
函数fx=11-x+lg1+x的定义域是( )
-- you a clock in your bedroom?
-- No, I don't.