问题
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
答案
参考答案：C
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Which of the followings does not belong to main maneuvering facilities?（）
A.rudder
B.propeller
C.radar
D.sider thruster
参考答案：C