The rudders are amidships and both screws are going ahead. What will happen if the starboard screw is stopped?（）

A.afford access to the shell through the double bottoms
B.collect water to be pumped out
C.provide access for the pneumercator
D.provide a base line for sounding measurements

A.the radio apparatus fitted on the portside
B.the radio with a portable equipment
C.the radio equipment which is easily movable
D.the portable radio with some apparatus

A.radial
B.sheath-screw
C.gravity
D.quadrantal