Contact us
Choose a category below so we can get back to you as quickly as possible.
列平衡方程時力的正負與投影坐標軸有關 列平衡方程時力矩的正負可以自己規定,一般取逆時針為正 彎矩的正負和變形有關.機類專業:彎曲變形凹向上時彎矩為正;建築類專業相反.
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.