由于入射声束与曲面相互作用造成的伪像称为:() ["幻影伪像","振铃伪像","彗尾伪像","边缘伪像","折射伪像"]
关于慢性球后视神经炎,以下哪项是错误的() ["如为烟中毒性弱视,患者有长期吸烟史","电生理检查可帮助与伪盲鉴别","多发性硬化病人中约1/3在病程中发生球后视神经炎","维生素B族缺乏可引起双侧慢性球后视神经炎","甲醇在体内代谢产生乙醇,从而引起视神经损害"]
心肌梗死症状中最先出现下列哪一项() ["发热","疼痛","恶心、呕吐","呼吸困难","昏厥"]
为急性坏死性胰腺炎特点的是() ["上腹部持续性刀割样疼痛","恶心、呕吐","黄疸","中等程度发热","脐周或肋、腹部皮肤青紫色"]
B型超声是指() ["振幅调制型","辉度调制型","彩色血流显像","多普勒频谱显示","以上都不是"]
气化炉的常规检修内容包括哪些?