单项选择题
A.0.21kg B.0.22kg C.0.23kg D.0.24kg
A.4.63MJ/kg B.3.63MJ/kg C.5.63MJ/kg D.6.63MJ/kg
A.0.71 B.0.72 C.0.73 D.0.74
A.450KJ B.492KJ C.460KJ D.500KJ
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