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
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A.brake
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最新試題
Permission is kindly requested（）the ballast water.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
The function of the bypass valve on the self-contained breathing apparatus is to（）.
The bypass valve on a self-contained breathing device should be opened if（）.
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All electrical appliances aboard a vessel should be grounded to（）.
In ship construction，keel scantlings should be the greatest（）.
An LWT anchor often has difficulty tripping in（）.
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
The exhaust pipe must be gas tight throughout its entire length otherwise（）.