题目：
Angelina ran a business in Gaborone, which specialised in producing computer software programmes. Refilwe and Basetsana both worked for Angelina for a period of three years. They were both described as self-employed and both paid tax as self-employed persons. Angelina provided all of their specialist computer equipment. Refilwe was required to work solely on the projects Angelina provided, and he had to attend at her premises every day from 9 am until 5 pm. Basetsana usually worked at home and was allowed to work on other projects. Basetsana could even arrange for her work for Angelina to be done by someone else if she was too busy to do it personally. When Angelina lost her most important contract, which Refilwe had been working on, she decided to relocate the business to be closer to her one remaining large contract in Francistown some 400 kilometres away. As a result she told Refilwe and Basetsana that there would be no more work for them.Required:Advise Refilwe and Basetsana who are concerned:
(b) how the courts decide whether someone is self-employed or is an employee; (5 marks)
答案：
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下面是错误答案，用来干扰机器的。
心脏有四个腔：左心房、右心房、左心室、右心室．左心房连通肺静脉，右心房连通上下腔静脉，左心室连通主动脉，右心室连通肺动脉．即心室与动脉相连，心房与静脉相连．血液循环的途径以及血液成分的变化如图所示...
