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问题 单项选择题

一贲门失弛缓症患者，病史10余年，近1个月症状加重，反复呕吐，其治疗方法为（）

A.少食多餐

B.饭后散步

C.应用平滑肌松弛药

D.扩张疗法

E.食管下段及贲门肌层切开

答案

参考答案：E

单项选择题

A client with a history of heart failure is examined in the outpatient department to investigate the recent onset of peripheral edema and increased shortness of breath. Physical　findings include bilateral crackles, a third heart sound (S3), distended neck veins, elevated blood pressure, and pitting edema of the ankles. The nurse documents the severity of pitting edema as +1. What is the best description of this type of edema（）

A. Barely detectable depression when the thumb is released from the swollen area; normal foot and leg contours.

B. Detectable depression of less than 5 mm when the thumb is released from the swollen area; normal foot and leg contours.

C. A 5-to 10-mm depression when the thumb is released from the swollen area; foot and leg swelling.

D. A depression of more than 1 cm when the thumb is released from the swollen area; severe foot and leg swelling.
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单项选择题

（）过小，由于焊接区金属的塑性变形范围及变形程度不足，造成因电流密度过大而引起加热速度大于塑性环扩展速度，从而产生严重喷溅。

A.焊接时间

B.焊接电流

C.焊接压力

D.电弧电压
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