深孔加工刀具与短孔加工刀具不同的是,前后均带有(),有利于保证孔的精度和直线度。
A. 导向垫
B. 刀片
C. 导棱
D. 修光刃
粗车多线蜗杆螺旋槽时,齿侧每边留()的精车余量。
A. 0-0.1mm
B. 0.1-0.2mm
C. 0.3-0.4mm
D. 0.4-0.5mm
Explain and distinguish between the following terms in relation to the doctrine of precedent in the English legal system:
(a) ratio decidendi and obiter dictum; (4 marks)
(b) binding precedent and persuasive precedent. (6 marks)
在冰雪路面上行驶时,要用()控制车速。
A. 低速挡
B. 中速挡
C. 高速挡
D. 中高速挡