铸造工艺图的内容包括哪些方面?
参考答案:
浇注位置,铸造分型面,型芯的数量,形状,尺寸及其固定方法,加工余量,收缩率,浇注系统,起模斜度,冒口和冷铁的尺寸和位置。
—You must be surprised and excited to see the film star here.
—You’re right. __________.
A.I don’t expect to see her here
B.I didn’t expect to see her here
C.I am expecting to see her here
D.I expected to see her here
加氢精制催化剂预硫化方法有几种?