The I type shear blocks dowelled bidirectional hollow plates (I SBDBHPs) are the most widely used.
剪力键式双向空心大板中
Ⅰ型板(简称Ⅰ型空心大板),是该类空心大板中使用



板型。
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This bidirectional link between food production and population density explains the paradox that food production, while increasing the quantity of edible calories per acre, left the food producers less well nourished than the hunter-gatherers whom they succeeded.
粮食生产和人口密度之间
种双向联系解释了
样一个悖论:粮食生产在增加每英亩
食用热量
同时,却使粮食生产者
营养状况不如他们所继承
狩猎采集者。