傅立叶准数及其物理意义
参考答案:
也称时间准数,表示非稳定传热所进行的时间与其达到平衡状态所需要的总时间比;或τ时间内非稳态传热的热量与其到达稳态(平衡)时传输的总热量之比。
It is hard for me to imagine what I would be doing today if I ____ in love, at the age of seven, with the
Melinda Coz Library in my hometown.[ ]
A. wouldn’t have fallen
B. hadn’t fallen
C. should fall
D. were to fall
工业制硫酸中,存在可逆反应2SO2(g)+ O2(g)2SO3(g),在已达到平衡后的反应容器中充入少量18O2,一段时间后18O存在于:
A.O2
B.O2和SO2
C.O2和SO3
D.SO2、O2和SO3