フリー問題

問題文

A retail chain asks why the same antenna cannot serve both the shop floor and a link to a depot two kilometers away. Which pair states where the omnidirectional model fits and what the long outdoor link needs instead?

選択肢

1. The doughnut shape spreads the energy around the mast, so the omnidirectional model covers the open floor and the long outdoor link needs the narrow beam in that deployment.
2. The doughnut shape spreads the energy around the mast, so the omnidirectional model covers the open floor and the long outdoor link needs the narrow spacing in that deployment.
3. The doughnut shape spreads the energy around the mast, so the omnidirectional model covers the open highway and the long outdoor link needs the narrow beam in that deployment.
4. The doughnut shape spreads the energy around the mast, so the omnidirectional model covers the open highway and the long outdoor link needs the narrow spacing in that deployment.