Hydrological analysis and calculation is to predict the probability distribution of the hydrological variable . A: during any period B: during a foreseeable period C: for a very long time in the future D: at a certain moment

We can trace many causes for the occurrence and development of hydrological phenomena. Therefore, the change in hydrological phenomena . A: has a completely deterministic pattern B: has a completely statistical pattern C: has causality pattern D: has no pattern