单项选择题
When hitting a solid object such as ship or an airplane,the radar waves are reflected back（）they came.
A.in the way
B.the way
C.by the way
D.through the path
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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
