单项选择题

Permission is kindly requested（）the ballast water.

A.pump out
B.to pump out
C.pumping out
D.be pumped out

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单项选择题

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

单项选择题

Limit switches are used on which davits?（）

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

单项选择题

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