Every line-throwing appliance shall be capable of throwing a line of no less than 4 mm in diameter for a distance of______ in calm weather.(1.0)
A.220m B.230m C.240m D.250m正确答案B
Every line-throwing appliance shall be capable of throwing a line of no less than 4 mm in diameter for a distance of______ in calm weather.(1.0)
A.220m B.230m C.240m D.250m正确答案B