At least（）radar transponder shall be carried on each side of every cargo ship of 500 gross tonnage and upwards.<br>A:one<br>B:two<br>C:three<br>D:four

At least（）radar transponder shall be carried on each side of every cargo ship of 500 gross tonnage and upwards.
A:one
B:two
C:three
D:four

出自：海船船员证

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