扩孔时的切削速度一般为钻孔时的(),进给量为钻孔时的1.5~2倍。 ["1/4","1/2","15倍","2~3倍"]
妊娠合并急性阑尾炎的特点中,不正确的是() ["疼痛位置不典型","体温不增高","炎症易扩散","可导致流产","腹膜刺激征不明显"]
设立公共航空运输企业应当有必需的依法取得执照的().
下肢丹毒易导致() ["组织坏死","化脓","反复发作","败血症","脓血症"]
发生于口底颌下的急性蜂窝织炎最严重的后果是() ["面部蜂窝织炎","纵隔化脓性感染","呼吸困难、窒息","吞咽困难","脓毒血症"]
设立公共航空运输企业应当有符合国家规定的适应保证飞机安全要求的().