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1.underground launching silo
地下发射井收藏指正
2.United States Government underground missile silo. Designation Code 41.
美国政府的地下导弹发射井。代号41。收藏指正
3.As silo is required and it is not convenient for receiver and launcher installation and pig disassembly, underground installation is not adopted now.
地下安装需设发射井，安装收发球筒及装卸清管器均不方便，现已不采用。收藏指正
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