（一）跨地级行政区（直辖市下辖县区）提供建筑服务；
f(x1,x2)=x1⋅Swish(x2)=x1⋅(x2⋅σ(x2))
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The LGM-35A Sentinel will replace the Air Force's Minuteman III fleet, in service since 1970, with the first of the new missiles due to become operational in the early 2030s. But it will take longer than that to build and activate the full complement of Sentinel missiles and the 450 hardened underground silos to house them.
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