题目内容
Because of the successive heavy rains, officials in Shanxi Province launched a l________ e________ r________ .
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The province's flood control and drought relief headquarters closed seventy-four s______ s______, including Pingyao ancienty city, and shut down twenty-seven c______ m________, as well as ninty-nine other mines and seven c_________ f_________.
防护水下路基边坡时 , 不宜采用 ( ) 。
下面哪些现象属于生态系统的营养信息传递?
生态因子具有非等价性，其中必有1-2个是起关键作用的主导因子，因此，缺失的因子可以用另一个因子代替。
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