刺辊分梳度一般以每根纤维受到的（）来表示。
参考答案：平均作用齿数
过点P（-1，2）且与曲线y=3x2-4x+2在点M（1，1）处的切线平行的直线方程是______．
It is well known that ____ the flower is to grow,____the price is in the market.
A．harder; higher
B．the harder; the higher
C．the more hard ; the more high
D．more harder ; more high
