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我国内河港站数以千计,需要的吊机数很多,码头前方采用固定吊机好还是流动吊机好?这个问题是很值得研究的。下面就收
There are thousands of inland river port stations in our country, requiring a large number of cranes. Is it good to use fixed cranes or mobile cranes in front of the wharf? This issue is worth studying. The following income