题目内容
Chinese People's Volunteers fought not only against the well-equipped American army but also the extreme cold winter in 1950 in the battle at Lake Changjin.
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Because of the successive heavy rains, officials in Shanxi Province launched a l________ e________ r________ .
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?
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