单选题Radar reflectors are required for（）.Aall fishing vessels over 39 feet in lengthBsail-propelled fishing vesselsCall fishing vessels of less than 200 GTDwooden hull fishing vessels with a poor radar echo
单选题
Radar reflectors are required for（）.
A
all fishing vessels over 39 feet in length
B
sail-propelled fishing vessels
C
all fishing vessels of less than 200 GT
D
wooden hull fishing vessels with a poor radar echo
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