15.1 Direct observation method

15.1.1 This test method is applicable to the coarse-sands and medium-sands.15.1.2 The main apparatus shall meet the following requirements.(1) Apparatus of capillary: Including bracket, glass cup and glass tubewith thick wall. The internal diameter of the ......（本文共 1840 字 , 3 张图）     [阅读本文] >>