Which radiotelephone signal indicates receipt of a distress message?（）

The use of the danger signal（）.

In radiotelephone communications，the prefix PAN-PAN indicates that（）.

To reduce mild fever the MOST useful drug is（）.

What is normally used to pass a mooring line to a dock?（）

What is the normal length of anchor cable used to anchor a vessel?（）

There is something wrong with our radar．All kinds of objects can’t be clearly（）within the definite range.

To predict the actual depth of water using the Tide Tables，the number obtained from the Tide Tables is（）.

To develop maximum anchor holding power，the optimum angle between the anchor’s shank and the mooring lines is（）.

The vessel was drifted off from her（）due to strong wind.