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【简答题】
图(a)所示薄方板作用有均布应力σ x =200MPa，σ v =100MPa，设材料遵循胡克定律，相应应变为ε x =2.42×10 -3 ，ε v =0.49×10 -3 ，求1)板材的弹性模量E和泊松比v；2)如在板的四边加上均布剪应力(图(b))τ xy =8MPa，求剪应变γ xy 。
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【单选题】Where can you find a Spanish language bookstore?
A.
In Chinatown.
B.
In Japantown.
C.
Anywhere in the city.
D.
In the Mission District.
【单选题】Where can you find a topic sentence?
A.
1st sentence of the body paragraph
B.
last sentence of the body paragraph
C.
in the middle of the body paragraph
D.
in the conclusion paragraph
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