8077.Proper pre-preg composite lay-up curing is gener- ally accomplished by1.applying external heat.2.room temperature exposure.3.adding a catalyst or curing agent to the resin.4.applying pressure.
发布于 2021-02-18 18:45:18
【单选题】
A 2 and 3.
B 1 and 4.
C 1,3, and 4.
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