Linda is a 19-year-old primipara who delivered a viable male neonate 2 hours ago. She has decided to breast-feed. Her 22-year-old husband supports her decision. She tells the nurse, "My mother breast-fed all of her children, but I’m going to need lots of help with breastfeeding. I’m worried that I won’t be able to do this. " Which of the following should the nurse include when assessing the client

A. Determine the client’s level of motivation to breast-feed.
B. Perform a complete physical examination to determine her need for help.
C. Assess her body-to-fat ratio and nutritional status before beginning breast-feeding.
D. Ask the client if she has read any literature about breast-feedin

900mm酸联轧酸洗除去氧化铁皮的机理是（）

A.化学反应

B.物理反应

C.物理反应+化学反应

D.以上都不对