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

1970年美国进行导弹发射试验时，由于操作员对一个螺母少拧了半圈，导致发射失败。1980年“阿里安”火箭爆炸，是由于操作员不慎将一商标碰落，填塞了燃烧室喷嘴，导致发射失败。你认为以上事故主要是由于（ ）造成的。

A．螺母质量不过关

B．环境不卫生

C．管理制度不健全

D．从业人员没有严格遵守操作规则