試料は通常、棒状または板状の形状を持ち、引張力を加える部分には均等な断面が必要です。 PinPlanet Is a bunch of workers who are keen about taking good care of our Earth. PinPlanet inspires action that preserves our planet, the livelihood, and psychological effectively-being of Pinterest employees plus the communities we live in, to assist create a sustainable future for all. surprise, in... waiting for link from Wiki Articles