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【单选题】
下列低碳钢拉伸实验中弹性阶段说法错误的是( )A.
应力和应变成正比，其比值为常数，称作弹性模量
B.
有不可恢复的变形
C.
钢筋受力达到屈服强度
D.
钢筋的变形可恢复
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【简答题】作业八.doc
【简答题】下列各物体受力图是否正确?若有错误请改正。
【多选题】Analyzing marketing opportunities means to do the following activities EXCEPT ( )
A.
marketing research
B.
advertising effect research
C.
consumer markets and consumer buyer behavior research
D.
product design research
E.
business markets and business buyer behavior research
【简答题】自上而下设计中可逐层___________,逐层_____________,保证满足系统指标
【单选题】In a marketing sense, demand means ______.
A.
a day-to-day survival requirement.
B.
a want that a consumer has the ability to satisfy.
C.
a product that doesn't yet exist.
D.
requirements that consumers do not have the resources to satisfy.
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