When testing a Class A EPIRB you will know the EPIRB is working properly if you hear on 99.5 Mhz FM or any vacant frequency on a nearby AM radio（）.

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

The use of the danger signal（）.

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

What are symptom(s) of a ruptured appendix?（）

The term OIL as used in the Oil Pollution Regulations means（）.

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

PAN-PAN repeated three times over the radiotelephone indicates which type of message will follow?（）

What happens to the efficiency of an anchor when it is moved from sand to mud?（）

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