A.Safe working load
B.Ship's working lift
C.Starboard wing lift
D.Stress，weight，load
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A.crow bar
B.device to force a water tight door against the frame
C.heavy steel beam
D.wedge
A.that the fuel valve is open
B.if the air supply system is open
C.if the water sprinkler system is open
D.if the limit switch is on
A.a defective ignition system
B.low lube oil level
C.weak valve springs
D.too heavy a load
A.once each crankshaft revolution
B.twice each crankshaft revolution
C.every other crankshaft revolution
D.every fourth stroke
A.They are less expensive
B.They are smaller for equivalent pumping ability
C.They pump more cargo in less time
D.All of the above
最新試題
In ship construction，frame spacing is（）.
An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.
In ship construction，keel scantlings should be the greatest（）.
Limit switches are used on which davits?（）
As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.
The rudders are amidships and both screws are going ahead. What will happen if the starboard screw is stopped?（）
Static electricity may be built up by the（）.
An example of a modern anchor which has a stock is a(n)（）.
All electrical appliances aboard a vessel should be grounded to（）.
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.