你了解二节棍吗?

尽管影观上的李小龙二节棍技艺给你留下了深刻的印象,但你不一定了解二节棍运动。其实二节棍不但打人厉害,而且还是实用性极强的健身器械。近年来,二节棍在全国以至世界各地广泛传播,主要的原因是它具备了很多适合现代人味口的特点。

原木材积求算方法的研究

将原木的纵断面形状看作为"抛物线",测定原木的小头直径(进行径阶区划,以下简称:小径)和大头直径实际值,利用《原木材积表》结合抛物线体的计算公式,对原木材积进行求算,这样求算的原木材积将会更接近实际。

The vertical shaft construction technology of cutter head transformation of large diameter shield

Taking vertical shaft construction of cutter transformation of the Beijing underground diameter shield for example,the design and construction of cutter structure transformation under complex boundary conditions for large diameter shield were discussed.Practice about how to ensure the structure safety of the shaft as well as well-coordinated shield construction was explored,and reliable solutions were provided successfully,which can provide reference for similar projects.