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【单选题】
The little boy woke up his father, _______ “Happy Birthday!”
A.
call
B.
to call
C.
called
D.
calling
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【单选题】The result will be a ______ under repeated or fluctuating stresses (loads) having a maximum value less than the tensile strength of the material.
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B.
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C.
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all of the above
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【单选题】According to Von Mises theory, the elastic failure occurs ( )
A.
when the shear strain energy is least
B.
w hen shear strain equals 50% of the value of tensile strain at elastic limit in a simple tension test
C.
when the shear strain energy per unit volume in the stressed material equals shear strain energy per unit volume at the elastic limit in a simple tension test
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