∵函数y=-6x中k=-6<0,
根据反比例函数的性质当x>0时,y随x的增大而增大.
In the past few years there ______ great changes in my hometown.
A.have been
B.were
C.had been
D.are
憎液溶胶的散射光()亲液溶胶的散射光()。
A、强,弱
B、强,强
C、弱,强
D、弱,弱