题目

In this giant city, they had no one else ________ support they knew they could count on. A . of whom B . of which C . whose D . that 答案：C如图为焦耳实验装置图，用绝热性能良好的材料将容器包好，重物下落带动叶片搅拌容器里的水，引起水温升高．关于这个实验，下列说法正确的是（　　）A、这个装置可测定热功当量B、做功增加了水的热量C、做功增加了水的内能D、功和热量是完全等价的，无区别