“特雷尔冶炼厂仲裁案”体现的国际环境法的原则是()
A.谨慎原则
B.国际环境合作原则
C.国家主权与不损害管辖范围以外环境原则
D.防止环境损害原则
参考答案:C
— Have you got any particular plans for the coming holiday?
— Yes, _____, I’m going to visit some homes for the old in the city.
A.If ever
B.If busy
C.If anything
D.If possible
(5分)物理兴趣小组的同学们做了这样的实验:取500g水放在烧杯中,测得水的温度为20℃,然后点燃酒精灯给烧杯加热,并将温度计插在水中观察水温的变化,当温度计的示数恰为70℃时,消耗了10g的酒精. [C水=4.2×103J/(kg·℃)]
(1)请计算出实验中水吸收了多少热量?
(2)有的同学试图用水吸收的热量来计算酒精热值,请回答这种做法是否可以?并说明理由.