若X线机供电电源有220V和380V两种,最好选用() ["DC220V","AC380V","DC220V","DC380V","两种并用"]
下列呼吸音以外的附加音,除哪项外均只见于病理情况() ["小水泡音","中水泡音","大水泡音","捻发音","哮鸣音"]
若管电压为100kVp,则高压电缆对地电压为() ["50kVp","60kVp","70kVp","100kVp","200kVp"]
靶面倾角是X线管的() ["电参数","结构参数","容量参数","极限参数","物理参数"]
具有结构简单、价格低廉、可靠性高,但灵敏度较低等特点的火灾探测器是()。 ["感温火灾探测器","感烟火灾控测器","感光火灾探测器","气体火灾探测器"]
计价器的周期检定由()负责。