When hitting a solid object such as ship or an airplane,the radar waves are reflected back（）they came.

单项选择题What does SSO stand for regarding ship security?（）

A.Ship security office
B.Ship security officer
C.Ship security operator
D.Ship safety office

单项选择题（）provides a selection of commonly used routes with their distances between principal and important positions.

A.The Mariner‟s Handbook
B.Admiralty Sailing Directions
C.Ocean Passages for the World
D.Mariner‟s Routeing Guide

单项选择题Which of the followings does not belong to main maneuvering facilities?（）

A.rudder
B.propeller
C.radar
D.sider thruster

单项选择题There shall be（）into sleeping rooms from cargo and machinery spaces or from galleys,storerooms,drying rooms or communal sanitary areas.

A.no direct openings
B.direct openings
C.no more than one direct opening
D.up to one direct opening

单项选择题A power-driven vessel shall have her engine ready for（）when the visibility is restricted.

A.immediate stopping
B.immediate maneuvering
C.immediate anchoring
D.immediate going astern