Tell the foundry to cast another piston.

告诉铁间再一只活塞。

Benzylic ether phenolic resin is one of the main components of foundry polyurethane binder; its structure and preparation condition determine the performances of polyurethane binder.

苯醚型酚醛树脂是造聚氨酯粘合剂的主要成份之一,它的结构及合成工艺条件决定了该类粘合剂性能。