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・ Pisz County
・ Piszczac
・ Piszczac-Kolonia
・ Piszczatka, Hajnówka County
・ Piszczatka, Siemiatycze County
・ Piszczaty-Kończany
・ Piszczaty-Piotrowięta
・ Piszewo
・ Piszkawa
・ Piszkowice
・ Piszkéstető Station
・ Pit
・ Pit (botany)
・ Pit (game)
・ Pit (Kid Icarus)
Pit (nuclear weapon)
・ Pit 3 Dam
・ Pit 6 Dam
・ Pit 7 Dam
・ Pit additive
・ Pit alignments
・ Pit barbecue
・ Pit Beirer
・ Pit bike
・ Pit Boss (TV series)
・ Pit brow women
・ Pit bull
・ Pit Bull (TV series)
・ Pit Bulls & Parolees
・ Pit cave


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Pit (nuclear weapon) : ウィキペディア英語版
Pit (nuclear weapon)

The pit, named after the hard core found in fruits such as peaches and apricots, is the core of an implosion nuclear weapon – the fissile material and any neutron reflector or tamper bonded to it. Some weapons tested during the 1950s used pits made with U-235 alone, or in composite with plutonium,〔("Restricted Data Declassification Decisions from 1945 until Present" ) – "Fact that plutonium and uranium may be bonded to each other in unspecified pits or weapons."〕 but all-plutonium pits are the smallest in diameter and have been the standard since the early 1960s.
==Pit designs==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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