A、lifejacket
B、SCBA
C、lifeboat
D、torch
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A、two rockets，one of which shall be the buoyant type B、three rockets，one of which shall be the buoyant type C、four rockets，two of which shall be the buoyant type D、five rockets，two of which shall be the buoyant type
A、high-pressure steam-driven air-ejector B、motor-driven vacuum pump C、water-motivated air eductor D、centrifuge pump
A、cannot be nested B、manipulate data items C、act on each row returned D、return one result per row E、accept only one argument and return only one value F、accept arguments which can be a column or an expression
A、cannot be nested B、manipulate data items C、act on each row returned D、return one result per row E、accept only one argument and return only one value F、accept arguments which can be a column or an expression
A、A.cannot be nested B、B.manipulate data items C、C.act on each row returned D、D.return one result per row E、E.accept only one argument and return only one value F、F.accept arguments which can be a column or an expression
A、A.The hull must be clean B、B.There must be calm weather – wind 10 knots or less and a calm sea C、C.There must be no currents D、D.The depth of the water must be at least one and one-half times the draft
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