![15.1 Direct observation method](https://imgs.zsbeike.com/imgs/P/P06088/P06088_tm.txt.f61eaa.jpg)
 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 (共 1840 字) [閱讀本文] >>