题目内容

按照净样的轮廓线条，加放缝头、折边等打制出来的样板称为（)。

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将下列英语段落译成汉语：Two metal surfaces rubbing together cause friction and heat; but if they are separated by a thin film of oil, the friction and heat are reduced. No machine would work for long if it were not properly lubricated. The oil used for this purpose must be of the correct thickness; if it is too thin it will not give sufficient lubrication, and if it is too thick it will not reach all parts that must be lubricated.

什么是“实验教育学”？

聚合反应均为放热和热动力不稳定过程，当热量来不及导出时会出现“爆聚”现象。

阳明三急下的意义是（)。