磨削加工时。提高砂轮速度可使加工表面粗糙度值()。
A、变大
B、变小
C、不变
D、不一定
参考答案:B
— Whose advice do you think I should take?
— ______.[ ]
A. It doesn't matter
B. That's it
C. It's up to you
D. Either is ok
有黏膜损害的药疹有()
A.痤疮型
B.大疱性表皮松解型
C.重症多型红斑型
D.剥脱性皮炎型
E.固定型