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理学
放射性元素
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protactinium
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天然放射性元素,元素符号Pa,原子序数91,原子量为231.03588,属周期系ⅢB族,锕系元素。
Astronomy
全称:protactinium。缩写:Pa
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Chemistry
>放射化学与辐射化学>放射性元素化学>释义
protactinium
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metal fire
metal flakes or fragments
metal-foil
metal foils
metal for doors and windows
metal freezing point balckbody
metal fuels
metal gan
metal gear
metalgorithm
metal halide cluster
metal halide lamp
metal hydride
metal hydride heat pump
metal hydride hydrogen storage
metal hydrides
metalimnion
metal indicator
metalinear
metal-in-gap head
metal-in-gap head, MIG head
metal-insulate-semiconductor field effect transistor
metal-insulate-semiconductor field effect transistor, MISFET
metal-insulator-semiconductor field-effect transistor
metal-insulator-semiconductor field-effect transistor, MISFET
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