cutting bitˈkʌtɪŋbit短语¹⁴⁴⁹⁷²⁺² 基本例句 钻头 Because coal and rock usually exist together in same section of laneway, on condition that power are constant, when cutting bit cuts the coal, high feeding velocity and low feeding force are needed; 由于在巷道同一断面内通常是煤岩共存,在功率一定的条件下,当截割煤时,需要高进给速度、低进给力; cnki