Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.

A.HF

B.VHF

C.MF

D.MF/HF

男，40岁，近几日出现低热，乏力，右侧胸部呈剧烈针刺样疼痛，深呼吸时加剧，医生诊断为右侧胸膜炎。

患者采用此种体位的目的是

A．预防并发症

B．利于治疗

C．减轻疼痛

D．便于护理

E．减少体力消耗