What is the MOST irritating to the skin?（）

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?（）

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

The expression DROP ANCHOR means（）.

What is the（）of the turning circle in mavoeuvring?

The radiotelegraph alarm signal is（）.

What is required to launch a boat stowed in a crescent davit?（）

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

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