单选题In the daytime，you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows（）.Aa basketBa black ballCa black coneDtwo black cones
单选题
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
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