1000M1400中M代表的含义是（）。
A.丝缕方向
B.纸张的宽度方向
C.纸张的长度方向
D.纸张的伸长率
参考答案：A
A client is in the first postoperative day after a total laryngectomy and radical neck dissection. Which of the following is a priority goal ？（）
A．Communicate by use of esophageal speech.
B．Improve body image and self-esteem.
C．Attain optimal levels of nutrition.
D．Maintain a patent airway.
煤炭粉尘属（）。
