如果上游工厂污染了下游居民的饮水,按科斯定理,( )问题就可妥善解决
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
如果上游工厂污染了下游居民的饮水,按照科斯定理,( )问题可妥善解决
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