IOC-1200支持的供电类型是()? ["380V交流电","220V交流电","24V直流电","12V直流电"]
构型
用一个远用矫正和一个近用矫正两个部分组成的镜片为()。 ["近用镜片","远用镜片","渐变镜片","双焦点镜片"]
诊断试验的指标可分为客观指标,主观指标和半客观指标,下列哪项属于主观指标?() ["能用客观仪器测定的指标","很少依赖诊断者的主观判断","用体温计测定体温","用X线片观察肺部或骨骼病变等","疼痛、乏力、食欲不振等主诉"]
ASCII码35H所代表的字符应为() ["‘5’","‘A’","‘B’","‘G&rsquo"]
什么是流体的压缩性和膨胀性?