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三根杆尺寸相同，材料不同，其σ-ε曲线如图所示，则（ ）强度最高。【图片】
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举一反三
【单选题】why didn't steven travel to visit his mother?
A.
he was busy
B.
he was free
C.
he bought a mobile phone to call her
D.
he was unemployed
【单选题】—Why didn’t you finish the task? —I didn’t think it is ________ the effort.
A.
worthwhile
B.
deserving
C.
valuable
D.
worth
【单选题】She wanted to know ________ [ ]
A.
why didn't I think it was a good idea
B.
why I didn't think it was a good idea
C.
why I thought it wasn't a good idea
D.
why did I think it wasn't a good idea
【简答题】Why didn’t the man pass the exam?
【单选题】The mason ______ I didn't do this exercise is I didn't know how to do it.
A.
why...because
B.
why...that
C.
for...that
D.
that...because
【单选题】( ) see the film this evening?
A.
Why don't we go to
B.
Why didn't we go to
C.
Why aren't we go to
【单选题】—Why didn't Alice come to the party last night? —I don't know ______. [ ]
A.
why didn't she
B.
why she didn't
C.
why did she
D.
why she did
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