铧式犁进行耕地作业时，机组前进速度增加时其犁耕牵引阻力（）。
参考答案：增加
若（x+2）•（x+m）=x2-3x-10，则m=______．
Man is short ________ water mow. So something must be done to stop people _________ wasting it.
A. of; from B. for; from C. for; to
