【名词&注释】
硬化性(sclerosing)、医务人员(medical staff)、技术水平(technical level)、禁忌证(contraindication)、血栓闭塞性脉管炎(thromboangiitis obliterans)、皮肤感染(skin infection)、遵纪守法、救死扶伤(heal the wounded)、下肢血栓性浅静脉炎、努力提高(strive to improve)
[单选题]On open lifeboats,the purpose of the wire stretched between the davit heads is to().
A. keep the movement of the davits at the same speed
B. keep the davits from slipping when they are in the stowed position
C. prevent vibration during lowering of the boat
D. support the manrope