冷却液的作用是冲刷走脱落的磨粒及磨屑、减少工件表面与磨粒间的摩擦,提高工件表面光洁度和砂轮耐用度,再者还能(),减少或避免工件烧伤、变形,并能使工件尺寸精确。
参考答案:带走磨削热
If you know a foreign language you can tell your foreign friends about your family, study _____ .
[ ]
A. such as
B. and so on
C. by far
D. besides
既是脱水剂,又可用作封片溶剂,对染料不溶的是()
A.正丁醇和叔丁醇
B.环己酮
C.四氢呋喃
D.还氧己环
E.松脂醇