Don't get things mixed up, just the z component of the force becomes Gm triple integral of delta cos phi sine phi d rho d phi d theta.

不要搞混，只是力的z分量罢了,它是Gm∫∫∫δcosφsinφdρdφdθ

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The Delta IV Heavy has since completed several more successful lift-offs, while its next launch is currently planned from Vandenberg Air Force Base, California, USA, next month.

Delta 4型重型运载火箭之后又成功完成了更多次的运载任务，目前它的下一次发射定于下个月在美国加州Vandenberg空军基地进行。

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The paper expatiates on the reason of unbalanced magnetic motive force and its preventive measures for asynchronous motor with multipath extended delta connection.

本文阐述了三相异步电动机延边三角形接法多路并联进线时磁动势不平衡的原因，并提出了相应的预防措施。

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Some jobs are expected to be opened to women this year, while others - including for special forces such as the Navy Seals and the Delta Force - could take longer.

BBC: Pentagon ends ban on women in frontline combat

They are a mixture of Green Berets, Rangers and the Delta Force from the Army, the Seals (which stands for Sea-Air-Land) from the Navy and the Air Force's combat controllers and para rescue teams.

BBC: Snipers

Members of the elite Delta Force were involved, they said.

CNN: Killed soldier devoted to family, country, parents say