The purpose of a bilge well is to（）.

All electrical appliances aboard a vessel should be grounded to（）.

As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.

Limit switches are used on which davits?（）

The portable radio apparatus means（）.

The exhaust pipe must be gas tight throughout its entire length otherwise（）.

The rudders are amidships and both screws are going ahead. What will happen if the starboard screw is stopped?（）

On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.

An LWT anchor often has difficulty tripping in（）.

Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.