先天性心脏病室间隔缺损的胸部X线征象以下哪项是错误的() ["肺动脉段突出","心尖圆钝上翘","肺血管影增粗","主动脉弓较小","左心室增大"]
()能得到较大的制动力,但由于对钢轨的损伤比较大,因此常用于高速列车紧急制动的一种补充制动手段。 ["闸瓦制动","盘形制动","磁轨制动","摩擦制动"]
下列属于低Ig血症是() ["体液免疫缺陷病","联合免疫缺陷病","肾病综合征","肺结核","霍奇金病"]
为了降低水煤浆中煤粉颗粒对管道的磨蚀及防止水煤浆在管道内的分离,水煤浆的推荐流速应在()范围之间。 ["3~5m/s","1~3m/s","0.2~1m/s","0.6~0.9m/s"]
检查人员通过()的方法可以检查客房各隐蔽处是否有灰尘。 ["看","摸(擦拭)","试(试用)","嗅"]
MPEG视频压缩编码方法中的图像类别有哪几种?