【判断题】低碳钢的比例极限σp=200MPa,弹性模量E=200GPa,当试件拉伸到轴向应变ε=0.002时,由胡克定律σ=Ε·ε来计算试件应力为σ=400 MPa。( )
【单选题】Malcolm’s way of learning new words was to______.
A.
first copy them out on paper
B.
open up the dictionary at random to a word he didn’t know
C.
study them right off the dictionary page
D.
recite them silently to himself
【判断题】低碳钢的比例极限σp=200MPa,弹性模量E=200GPa,当试件拉伸到轴向应变ε=0.002时,由胡克定律σ=Ε·ε来计算试件应力为σ=400 MPa。
【单选题】[4-3]以下关于货币单元抽样的说法中,不正确的是( )。
D.
货币单元起到一个类似钩子的作用,从而带出与之相关联的一个逻辑单元
【单选题】---She broke her mother’s favourite vase______ she stood up. ---It’s a pity!
【简答题】补偿导线与热电偶配套使用时,应注意哪些问题?