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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单项选择题

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

单项选择题

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

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