简述压缩模塑成型的工艺流程。
参考答案:
原料的准备,预压(热固性塑料),预热(热固性和热塑性塑料);模压
Many residents are supposed to ____ the motorway. It is not a wise decision.
A.build
B.building
C.be building
D.have built
轻烃回收装置的产品有()。
A.煤油
B.干气
C.液态烃
D.轻汽油