第1题: [单项选择]He did not tell his parents because he knew they would try to change his mind but he ______ in a colleague at work. A. involved B. joined C. engrossed D. confided 参考答案:D 答案解析:confide“吐露(秘密)”,只有它与in搭配符合结构要求。engross常用于“engross one self in...”,意思为“全神贯注地做……”;involve用于“involve on
第21题: [单项选择]有关X线束、照射野的叙述,错误的是() A. X线球管发射锥形X线束 B. X线束入射被照体曝光面的大小称照射野 C. 摄影时照射野应尽量大 D. 摄影中的X线束有一定的穿透能力 E. X线束中心部分的X线为中心线 参考答案:C 答案解析:X线摄影时,为减少散射线对照片对比度的影响,应将照射野缩小到能容下肢体被检部位。