A.a not knowing
B.an unknowing
C.an unknown
D.a not known
您可能感興趣的試卷
你可能感興趣的試題
A.brake
B.devil's claw
C.pawls
D.All of the above
A.sand
B.soft soil
C.stiff clay
D.heterogeneous soil
A.shear ram
B.blind ram
C.pipe ram
D.annular ram
A.articulated anchor
B.Flipper Delta anchor
C.Baldt anchor
D.Danforth anchor
A.fairlead
B.heaving line
C.stay
D.warp
最新試題
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.
The function of the bypass valve on the self-contained breathing apparatus is to（）.
The rudders are amidships and both screws are going ahead. What will happen if the starboard screw is stopped?（）
Limit switches are used on which davits?（）
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（）.
The holding capability of an anchor is primarily determined by the（）.
Permission is kindly requested（）the ballast water.
An example of a messenger is a（）.
In ship construction，frame spacing is（）.
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（）.