sea walls, bulk heads and groynes

sea walls, bulk heads and revetments

sea walls, revetments and groynes

bulk heads, revetments and groynes

vertical sea wall

sea wall with batter

stepped sea wall

sea wall with concave face

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not a correct explanation of A.

A is true but R is false.

A is false but R is true.

marine railways, dry docks, floating docks, wet docks

dry docks, wet docks, floating docks, lift docks

wet docks, floating docks, lift docks, marine railways

wet docks, lift docks, marine railways, dry docks

groynes

sea walls

revetments

moles