固结磨料加工和游离磨料加工各有何特点?
参考答案:
固结磨料加工有精密砂轮磨削、油石研磨、精密珩磨、精密超精加工、砂带磨削和砂带研抛。游离磨料加工有精密研磨和精密抛光。
下列词语中加粗字的读音完全相同的一组是 [ ]
A.地契 小憩 迄今 同仇敌忾 休戚与共
B.哕唆 夙愿 塑造 不速之客 沧海一粟
C.姻缘 谚语 妍媸 狼吞虎咽 雁过拔毛
D.娴静 弓弦 贤良 垂涎三尺 衔怨负屈
The teachers are doing what they _____ their students. [ ]
A. can to teach
B. can teach
C. can teaching
D. can to teaching