In relation to employment law, explain the similarities and differences between an employment contract and a contract that a company makes with an outside contractor. (10 marks)

我国海洋区域经济格不断完善，形成的三大海洋经济区是环渤海经济区、长江三角洲经济区、（）。

A、珠江三角洲经济区

B、黄河三角洲经济区

C、京津冀地区

D、山东半岛蓝色经济区