A new point is put forward that transverse bimoment has different influence on the two kinds of cross section thin-walled beams, and on their St-Venant principle conditions. 2.
同时对外载等效中经常出现
向双力矩这一广义力进行研究,指出它在开口和闭口薄壁梁约束扭转问题中和圣
南原理适用条件中

有不同
地位。
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In parallel, the lab takes a small cross section of the sample, freezes it, and thinly slices it with a scalpel -- effectively taking a " frozen snapshot, " says Hoving -- and then reviews it under a microscope in a process called a quick section.
同时,实验室会采集样本
一小部分横截面,将
冷冻,然后
手术刀将

薄片,霍文说,这实际上是拍摄“冷冻快照”,然后在显微镜下对
行检查,这个过程称为快速
片。