螺旋桨有四个桨叶。（）<br>A:The helm has four blades.<br>B:The propeller has forty blades.<br>C:The windlass has four blades.<br>D:The propeller has four blades.

螺旋桨有四个桨叶。（）
A:The helm has four blades.
B:The propeller has forty blades.
C:The windlass has four blades.
D:The propeller has four blades.

出自：船舶水手证

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