Our school has several weeks _____ in the summertime. [ ]
A. away
B. of
C. out
D. off
D
把一铁块浸没在盛满水的杯中,从杯中溢出10克水,若将该铁块浸没在盛满酒精的杯中,从杯中溢出的酒精的质量为______g.(ρ酒精=0.8×103kg/m3,g=10N/kg)
一杯水凝固成冰质量______,比热容______(填“改变”或“不变”).