左心功能不全的主要症状为
A．咳血
B．胸痛
C．呼吸困难
D．少尿
E．咳嗽、咳痰
参考答案：C
对正中关系的描述不正确的是（）
A．又称下颌后退位
B．又称正中关系
C．是一个功能性的后边缘位
D．是一个稳定可重复的位置
E．髁突处于关节窝的后位
An 18-year-old primagravida tells the nurse that the physician told her that she needed to increase her intake of thiamine (vitamin Bi) in her diet. Which of the following foods should the nurse instruct the client to consume more（）
A. Milk.
B. Rice.
C. Asparagus.
D. Beef.
