About 30 Global _____ Satellites go around the Earth "pinging" billions of devices, such as phones and car SATNAVs, so you know exactly where you are.
APavement
BPower
CPositioning正確答案
DPractice
答案與詳解
為什麼答案是 C
Positioning（定位）才是正解。GPS = Global Positioning System，正是透過約 30 顆衛星向手機、車載導航發送訊號以確定位置。
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