Time distribution types of environmental impacts can be divided as the follows: (1) dispersed and uncontinual type, it includes abrupt impact, periodic impact and random impact;
环境影响时间分布的类型可大致分为：（1）离散不连续分布，包括一次性突发影响，周期性影响、随机影响；
Time distribution types of environmental impacts can be divided as the follows: (1) dispersed and uncontinual type, it includes abrupt impact, periodic impact and random impact;
环境影响时间分布的类型可大致分为：（1）离散不连续分布，包括一次性突发影响，周期性影响、随机影响；
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