接上题,管道内空气的熵变和环境的熵变分别为__。 A: 114.74 J/(kg•K)、-33.33 J/(kg•K) B: 114.74 J/(kg•K)、33.33 J/(kg•K) C: -114.74 J/(kg•K)、-33.33 J/(kg•K) D: -114.74 J/(kg•K)、33.33 J/(kg•K)
接上题,管道内空气的熵变和环境的熵变分别为__。 A: 114.74 J/(kg•K)、-33.33 J/(kg•K) B: 114.74 J/(kg•K)、33.33 J/(kg•K) C: -114.74 J/(kg•K)、-33.33 J/(kg•K) D: -114.74 J/(kg•K)、33.33 J/(kg•K)
干空气的气体常数R为() A: 278.13J/(kg﹒K) B: 287.13J/(kg﹒K) C: 288.13J/(kg﹒K) D: 298.13J/(kg﹒K)
干空气的气体常数R为() A: 278.13J/(kg﹒K) B: 287.13J/(kg﹒K) C: 288.13J/(kg﹒K) D: 298.13J/(kg﹒K)
BC001计算脱水加热炉热负荷时,c水近似取()。 A: 0.24kJ/(kg·K) B: 4.1810/(kg·K) C: 4.8610/(kg·K) D: 4.68kJ/(kg·K)
BC001计算脱水加热炉热负荷时,c水近似取()。 A: 0.24kJ/(kg·K) B: 4.1810/(kg·K) C: 4.8610/(kg·K) D: 4.68kJ/(kg·K)
气体常数R的单位是( ) A: J/(kg) B: J/(kg·K) C: N/(kg·K) D: J/(K)
气体常数R的单位是( ) A: J/(kg) B: J/(kg·K) C: N/(kg·K) D: J/(K)
接上题,热机能够输出的最大功量为: A: 407.82 kJ/(kg•K) B: 307.82 kJ/(kg•K) C: 262.59 kJ/(kg•K) D: 162.59 kJ/(kg•K)
接上题,热机能够输出的最大功量为: A: 407.82 kJ/(kg•K) B: 307.82 kJ/(kg•K) C: 262.59 kJ/(kg•K) D: 162.59 kJ/(kg•K)
接上题,热机能够输出的最大功量为: A: 407.82 kJ/(kg•K) B: 307.82 kJ/(kg•K) C: 262.59 kJ/(kg•K) D: 162.59 kJ/(kg•K)
接上题,热机能够输出的最大功量为: A: 407.82 kJ/(kg•K) B: 307.82 kJ/(kg•K) C: 262.59 kJ/(kg•K) D: 162.59 kJ/(kg•K)
接上题,热机能够输出的最大功量为: A: 407.82 kJ/(kg•K) B: 307.82 kJ/(kg•K) C: 262.59 kJ/(kg•K) D: 162.59 kJ/(kg•K)
接上题,热机能够输出的最大功量为: A: 407.82 kJ/(kg•K) B: 307.82 kJ/(kg•K) C: 262.59 kJ/(kg•K) D: 162.59 kJ/(kg•K)
If a person weighs 68kg on Earth, about how heavy would he or she feel on Mars? A: 4 kg B: 26 kg C: 68 kg D: 136 kg
If a person weighs 68kg on Earth, about how heavy would he or she feel on Mars? A: 4 kg B: 26 kg C: 68 kg D: 136 kg
If a person weighs 68kg on Earth, about how heavy would he or she feel on Mars? A: 4 kg B: 26 kg C: 68 kg D: 136 kg
If a person weighs 68kg on Earth, about how heavy would he or she feel on Mars? A: 4 kg B: 26 kg C: 68 kg D: 136 kg
男孩1岁半,其每天所需要总热量的简单计算法为 A: 按每天460kJ/kg(110kcal/k,以后每增 1岁减去41.8kJ/kg(10kcal/k B: 按每天418kJ/kg(100kcal/k,以后每增 2岁减去41.8kJ/kg(10kcal/k C: 按每天460kJ/kg(110kcal/k,以后每增 3岁减去41.8kJ/kg(10kcal/k D: 按每天418kJ/kg(100kcal/k,以后每增 3岁减去41.8 kJ/kg(10kcal/k E: 按每天460kJ/kg(110kcal/k,以后每增 4岁减去41.8kJ/kg(10kcal/k
男孩1岁半,其每天所需要总热量的简单计算法为 A: 按每天460kJ/kg(110kcal/k,以后每增 1岁减去41.8kJ/kg(10kcal/k B: 按每天418kJ/kg(100kcal/k,以后每增 2岁减去41.8kJ/kg(10kcal/k C: 按每天460kJ/kg(110kcal/k,以后每增 3岁减去41.8kJ/kg(10kcal/k D: 按每天418kJ/kg(100kcal/k,以后每增 3岁减去41.8 kJ/kg(10kcal/k E: 按每天460kJ/kg(110kcal/k,以后每增 4岁减去41.8kJ/kg(10kcal/k