Take the pipe as an isolator, under the effect of the external load and the mid-plane gravitation mentioned above, the displacement, the internal force and the internalmoment can be worked out.
将管道作为隔离体,在外载荷及前述中面应力的影响下,求位移、内力、内力矩。
2
‘The process was not easy, but each ounce of effort and each moment of frustration and struggle pushed the internal construction project another little step, ’ David Brooks continues.