5. 專用於J3E無線電話，提供遇險使用之頻率，下列何者為正確？ (A) 500KHZ (B) 2182 KHZ (C) 2187.5KHZ (D) 158.6KHZ

3. By SMCP, choose one of the following sentences for expressing ”We expect that visibility will decrease to 50 meters.” (A) “Visibility will be limited to five zero meters”. (B) “Visibility will be reduced by five zero meters”. (C) “Visibility is expected to decrease to five zero meters”. (D) “Visibility is expected to be reduced by five zero meters”.