單項選擇題What is meant by the term “radio silence”?（）

A.Stations not directly involved with the on-going distress communications may not transmit on the distress frequency or channel
B.Stations remaining off the air to safeguard proprietary information
C.Two three-minute silent periods，at 15 and 45 minutes after the hour，that provide a transmitting "window" for distressed vessels to transmit distress alerts using J3E
D.Communications on a distress frequency or channel is banned for 24 hours following the cessation of the distress traffic


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1.單項選擇題Wat is NOT required in the radiotelephone log?（）

A.Distress and alarm signals transmitted or intercepted
B.Times of beginning and end of watch period
C.Routine navigational traffic
D.Daily statement about the condition of the required radiotelephone equipment

2.單項選擇題Upon receipt of a distress message，a merchant vessel is bound to proceed to the scene of the distress. Under which of the following cases would this NOT be true?（）

A.The vessel would arrive at the distress scene more than 36 hours after the receipt of the initial distress message
B.There are vessels closer to the distress scene that are proceeding to assist
C.The Master of the vessel in distress has requisitioned another vessel，and that vessel has accepted the requisition
D.You are on a tank vessel and the distress involves a major fire on board the other vessel

3.單項選擇題Three short blasts of the whistle means（）.

A.danger
B.I am in distress
C.the vessel is not under command (broken down)
D.I am operating astern propulsion

4.單項選擇題The signal to guide vessels in distress，which indicates，“This is the best place to land” is the（）.

A.horizontal motion of a white flag
B.letter K in Morse code given by light
C.code flag S as a hoist
D.firing of a white star signal

5.單項選擇題The service life of distress signals must be not more than（）.

A.forty two months from the date of manufacture
B.thirty six months from the date of the last inspection
C.twenty four months from the date of approval
D.twelve months from the date of purchase