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

The use of the danger signal（）.

What is the MOST irritating to the skin?（）

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

The radiotelephone safety message urgently concerned with safety of a person would be prefixed by the word（）.

Tripping defects in anchors frequently occur in（）.

To prevent a wooden hull from leaking you caulk it（）.

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

The expression DROP ANCHOR means（）.

Which is NOT a distress signal?（）