食管静脉曲张时，食管吞钡X线检查表现为：食管轮廓呈（），曲张静脉呈（）。
参考答案：虫蚀样改变；蚯蚓样或串珠状负影
控制噪声是城市环保的重要措施，下列哪种措施不能减弱噪声[ ]
A．机动车辆在市内严禁鸣笛
B．城市街道路旁安装噪声监测器
C．汽车排气管上安装消声器
D．城市街道路旁安装隔声板
When caring for a client during the second stage of labor, which action would be least appropriate
A．Assisting the client with pushing.
B．Ensuring the client's legs are positioned appropriately.
C．Allowing the client clear liquids.
D．Monitoring the fetal heart rate.
