Xīnxíng dǎodàn de hézhàndòubù yǐjīng wánchéng cèshì.
The new missile's nuclear warhead has completed testing.
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核战斗部 is military/technical terminology — the 战斗部 (zhàndòubù, 'fight part') is the warhead section of a missile, with 核 (hé, nuclear) prefixed. In journalism you'll more often see plain 核弹头 (hédàntóu).
