丁腈橡胶的塑炼特性是()
A、可塑性小韧性大
B、适合高温塑炼
C、容量大
D、结构稳定
参考答案:A
–Can you climb up the tall tree over there, David?
–Yes, let me _______.
A. to have a try B. not have a try C. have a try
阶台尺寸较大时,常()铣削。
A.在卧铣床上用三面刃铣刀
B.用组合铣刀
C.在立铣床上用端铣刀或立铣刀
D.用成形铣刀