X线透过被照体后形成的X线强度的差异,称为() ["人工对比度","天然对比度","X线射线对比度","胶片对比度","照片对比度"]
后囟由哪几片颅骨组成() ["2片顶骨,2片额骨","2片顶骨,1片枕骨","2片额骨,1片枕骨","2片颞骨,2片枕骨","2片顶骨,2片枕骨"]
摄影中减小运动模糊的叙述,错误的是() ["被照体固定","选择适当的呼吸方法","缩短曝光时间","短焦一片距","选用高速增感屏"]
幼儿胸部正位摄影,中心线经() ["第5胸椎","第6胸椎","第7胸椎","胸骨角水平","腋中线前5cm水平"]
骨盆轴是指() ["连接骨盆各平面任选点而成的假想轴线","连接骨盆各平面横径中点而成的假想轴线","连接骨盆各平面中点而成的假想轴线","连接骨盆各平面前后径中点而成的假想轴线","以上都不是"]
精炼过程中经常使用的造渣剂有哪些?加入量是多少?