In this paper, we give both a sufficient condition and an equivalent condition under which a direct product of F-covers is also an F-cover.

本文主要给出f -复盖的直积还是一个F -复盖的充分条件和充要条件。

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Once production begins, it will cover the USAF's entire fleet of 224 F-15Es.

一旦开始生产，它将覆盖usaf 224f - 15es的整个舰队。

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In case of F0B or C & F contract, the Buyers shall provide an open cover or provisional insurance before the time of shipment.

买方所要求的兵险和（或）其他任何附加保险须由买方自行投保。 在F．O．B．或C．& F．合约的情况下，买方必须在付运时间之前提供一份预约保险单或暂时保险单。

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The Air Force didn't immediately release a list of the specific units and bases that would be affected, but it said it would cover some fighters like F-16 Fighting Falcons and F-22 Raptors, and some airborne warning and control aircraft in the U.S., Europe and the Pacific.

NPR: Federal Budget Cuts Ground Air Force Aircraft