下列对维生素C理化性质的描述哪项不正确() ["水溶性,极易氧化","光照易使其破坏","碱性环境不易破坏","有铜铁等金属离子存在时容易氧化","结晶维生素C稳定"]
磁场强度测定可使用() ["万能电表","紫外分光光度计","交直流高斯计","示波器","声功率测定器"]
急性呼吸衰竭气管插管的适应症() ["呼吸不规则","呼吸道分泌物多","咳嗽反射消失","因反射消失","昏迷逐渐加深"]
急性心包炎的症状,除了() ["发热","呼吸困难","心前区痛","眩晕","干咳"]
肥厚型梗阻性心肌病的药物治疗,首选()。 ["硝苯地平","消心痛","β受体阻滞剂或维拉帕米、地尔硫","硝普钠","地高辛"]
多形红斑以()型常见,特征性皮损为()或()。好发于面颈部和四肢()端。