The joint of the riser in a marine riser system that compensates for heave，the up-and-down motion of a floater，is the（）.

Shell plating is（）.

A wildcat is a（）.

A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a（）.

Holes in the bulwark，which allow deck water to drain into the sea，are（）.

The purpose of cant frames in steel vessels is（）.

Buckler plates are（）.

The antennas of the trucks on deck are not fitted（）.

The platform that supports the derrickman when tripping pipe is called the（）.

The opening in the deck that leads the anchor cable outside the hull is the（）.