判断题

原油是一种透明液体。（）
A、正确
B、错误

答案：错误

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Complete the sentences with the given words or phrases (句子首字母要大写）
chemotherapy thermotherapy ,a hearing aid ,cryotherapy speech-language therapy
1.___is often used to cool burns or scalds(烫伤） in emergencies.2.Heat therapy ,also called _is used to relieve pain ,to stimulate blood circulation and to reduce inflammation.3.The main goal of _is to restore the ability to communicate accurately . 4. is one of the traditional ways of curing tumors 5.__helps to overcome defects （缺陷） in hearing

答案： (1)
Cryotherapy ...

中央回转接头起到了连接（[填空(1)]）、（[填空(2)]）与（[填空(3)]）的枢纽作用。

答案：上部液压动力源；
控制信号源；
下部执行元件