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【单选题】
板料的相对厚度t/D较大时,则抵抗失稳能力
A.
不确定
B.
不变
C.
D.
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A.
sacé
B.
sagué
C.
saqué
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A.
He holds his head up.
B.
He looks at a customer's eyes.
C.
He smiles.
D.
He doesn't turn his head or body towards the customers.
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A.
with his drooping head
B.
drooping his head
C.
raising his head
D.
with his head down
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A.
él
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el cual
C.
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cuál
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A.
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B.
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above
D.
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A.
la
B.
lo
C.
el
D.
los
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A.
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B.
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C.
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D.
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