【单选题】--- Could you tell me_____ yuanxiao in china? --- Usually at Lantern Festival.
【单选题】把一杯热水和一杯凉水同时放进冰箱,哪个会先结冰?()
【简答题】Where are the British Isles situated? In the ______
【简答题】一杯热水含有一定的热量 ,冷却到环境温度,这时的热量就已没有 值。
【简答题】把红墨水分别滴入一杯热水和一杯冷水中,都会观察到扩散现象,其中热水中的扩散更快,这是由于 。
【单选题】The Romans brought ______ to England after they invaded the British Isles.
【简答题】计算题:电路如图D-6所示,已知R 1 =6Ω,R 2 =4Ω,电压表PV的读数U为3.6V,电池的内阻r=0.4Ω,试求电流表的读数I应为多少?电源的电动势E为多少?
【多选题】一杯热水由50℃升温到80℃,再降温至50℃,此时内能改变量∆U= ,焓变∆H=
【单选题】听力原文:W: What do you think of China? M: Great and the people are very friendly. How does he feel about the Chinese people?