單項選擇題

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

A.prevent the passage of flammable gases
B.prevent the passage of poisonous vapors
C.delay the spread of heat and flames
D.maintain watertight integrity

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單項選擇題

Limit switches are used on which davits?（）

A.Sheath-screw davits
B.Gravity davits
C.Radial davits
D.Quadrantal davits

單項選擇題

In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.

A.Globe valve
B.Butterfly valve
C.Gate valve
D.Packless valve

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

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Limit switches are used on which davits?（）

In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.

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

In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.