三、說明採用單一 GPS 主站的 RTK 測量原理。（15 分）若配合內政部國土測繪中心的 eGPS 系統，則 RTK 如何施測？（10 分）

⑴Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. Coral aquaculture, also known as coral farming, is showing promise as a potentially effective tool for restoring coral reefs, which have been declining around the world.