GMDSS普通操作员 Distress，Urgency and Safety Communic第07讲：单选61-80 Distress, Urgency and Safety Communic第07讲：单选61-80.ppt

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2020-11-16 发布于北京
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GMDSS普通操作员 Distress，Urgency and Safety Communic第07讲：单选61-80 Distress, Urgency and Safety Communic第07讲：单选61-80.ppt

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航运系航海教研室航运系航海教研室航运系航海教研室航运系航海教研室航运系航海教研室航运系航海教研室航运系航海教研室航运系航海教研室航运系航海教研室航运系航海教研室航运系航海教研室航运系航海教研室 Chapter 2 Distress, Urgency and Safety Communications 61. How many total frequencies are available for DSC distress alerting on VHF band? A. 1. B. 2. C. 5． D. 7. Chapter 2 Distress, Urgency and Safety Communications 62. How many total frequencies are available for DSC distress alerting on MF/HF transceiver? A. 1. B. 5. C. 6． D. 7. Chapter 2 Distress, Urgency and Safety Communications 63. How many frequencies are available for DSC distress alerting on HF band? A. 1. B. 2. C. 5． D. 7. Chapter 2 Distress, Urgency and Safety Communications 64. Which one of the following is a compulsory watch must a vessel maintain when sailing in sea area A1? A. A continuous DSC watch on 8,414.5 kHz plus one other HF DSC frequency. B. A continuous DSC watch on 2,187.5 kHz. C. A continuous DSC watch on Channel 16. D. A continuous DSC watch on Channel 70. Chapter 2 Distress, Urgency and Safety Communications 65. In the GMDSS, by what means and in which frequency bands should a ship station in distress alert other ships in its vicinity? A. Using Digital Selective Calling in the very high frequency and medium frequency band. B. Using radiotelephony on 2,182 kHz. C. Using radiotelephony on 2,182 kHz and on Channel 16 (156. 8 MHz). D. Using Digital Selective Calling in radio telephony in the very high frequency and high frequency bands, in radiotelegraphy in the medium and very high frequency bands. Chapter 2 Distress, Urgency and Safety Communications 66. When MF/HF DSC equipment is switched on, which frequency would be kept watch automatically by the receiver? A. 2,187.5 kHz. B. 8,414.5 kHz. C. 12,577 kHz. D. 2,187.5 kHz and 8,414.5 kHz. Chapter 2 Distress, Urgency and Safety Communications 67. Which of the following is not a DSC watch or distress and safety frequency? A. 2,182 kHz. B. 2,187.5 kHz. C. 6,312 kHz. D. 12,577 kHz. Chapter 2 Distress, Urgency and Sa