27.1mol氦气（视为单原子分子理想气体），在温度由17℃升高到27℃的过程中保持压强不变，求气体吸收的热量、对外界做的功
商品生产过程中创造商品价值的劳动是()
Ataskofthepostofficestaffisto_(class)mailaccordingtotheplacesitistogo
Decisiononwhetherthemessageisrightorwrongshouldatleastcomeafter_____whatthemessageis.
Theteacherrequiredthatallerrorsshouldbe_______eliminatedbeforethestudentsturnintheirtermpaper
