In the daytime，you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows（）.<br>A:a basket<br>B:a black ball<br>C:a black cone<br>D:two black cones

In the daytime，you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows（）.
A:a basket
B:a black ball
C:a black cone
D:two black cones

出自：海船船员证

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