There're two kinds of balls in which the red ones are wood balls and the blue ones are iron balls.
标贯击数为0~2击的为Ⅰ1软粘性土,土层埋深一般为0.28.0m
什么叫 标贯击数?
There're two kinds of balls in which the red ones are wood balls and the blue ones are iron balls.
标贯击数为0~2击的为Ⅰ1软粘性土,土层埋深一般为0.28.0m
什么叫 标贯击数?