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並前往https://books.google.com.tw/books?id=lSqeHiQrCs4C&pg=PA226&lpg=PA226&dq=EMT-1+PTT&source=bl&ots=h8bpe4ZL25&sig=ACfU3U36ZgMkT9VYNTGswaXcTzxZ5YAKdA&hl=zh-TW&sa=X&ved=2ahUKEwjux6Dgzvj-AhUS1GEKHVU-AUkQ6AF6BQiLAhAD

Aehlert's EMT-basic Study Guide - 第 226 頁 - Google 圖書結果

9-1-1 allows rapid access to police , fire , and EMS . b . ... Press the push - to - talk ( PTT ) button on the radio and wait one second before speaking .

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