潜伏期平均约需() ["6小时","8小时","10小时","12小时","16小时"]
有顶盖的架空通廊,按通廊的()计算建筑面积。 ["投影面积","投影面积的1/2","顶盖的投影面积","顶盖投影面积的1/2"]
X线呈矢状方向从患者的后方垂直射入胶片时的体位是() ["侧位","前后位","后前位","颌顶位","顶颌位"]
X线自被照体的前面投向后面称为() ["前后方向投射","后前方向投射","冠状方向投射","轴方向投射","切线方向投射"]
平整场地指原地面与设计室外地坪标高平均相差()以内的原土找平。 ["45cm","20cm","30cm","60cm"]
什么是钢和铁?