雷氏夹是做水泥安定性实验用的器具,由铜质材料制成,外表镀镍。其表面上很难刻画标志。即使刻画上,也容易受水垢的影响,难以辩认。而用废弃的饮料罐很容易为其编号。具体做法如下。取一只空易拉罐,将上、下盖剪去,然后将罐身 The Leybold clip is used for cement stability test. It is made of copper material with nickel plating. It is difficult to depict the logo on its surface. Even if it is portrayed, it is easily affected by scale and it is difficult to identify. And it’s easy to number them with discarded beverage cans. The specific approach is as follows. Take an empty can, cut the upper and lower covers, and then put the can