在市场经济时代，企业关注的焦点逐渐由过去关注客户转移到关注产品上来。
用于检查结构构件混凝土强度的试件应（）抽取。 ["在混凝土的搅拌地点搅拌第一盘时","在混凝土的搅拌地点随机","在混凝土的浇筑地点刚开始浇筑时","在混凝土的浇筑地点随机"]
A consulting firm is locating 30 consultants at a client site for a nine-month project. What need does the firm have that can be met by a wireless solution? （） [" Ensuring secure presentations","Augmenting an existing network","Providing a temporary network need","Having freedom of movement within a network range"]
当一个企业的生产计划发生改变时，需要其他企业的计划也作出相应的改变，供应链才能获得同步的响应。
感应加热淬火时，若频率为50kHZ，则淬硬层深度为（）。 ["0.5—2mm","2—8mm","10—15mm","18—28mm"]
胎儿胎盘
