A.positive correction
B.dip error
C.negative correction
D.semidiameter error
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A.Restricted area
B.Closed area
C.Prohibited place
D.Forbidden place
A.beats
B.beasts
C.bacons
D.battens
最新試題
As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.
The function of the bypass valve on the self-contained breathing apparatus is to（）.
Limit switches are used on which davits?（）
In relation to cargo gear，what does SWL mean?（）.
In ship construction，frame spacing is（）.
In ship construction，keel scantlings should be the greatest（）.
An example of a messenger is a（）.
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.
The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
The most common type of davit found on merchant vessels today is the（）.