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【单选题】
How do Soffer's theories compare with those of more conservative researchers?A.
They are in agreement for the most part regarding the activities that women performed.
B.
Softer has based her theories on archeological evidence that her colleagues had not considered.
C.
Conservative researchers are doubtful about the studies of stone tools and big-game bones.
D.
Her theories are much more difficult to prove because she relies on modern cultural evidence.
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【简答题】对于流体在圆管内的流动,可用雷诺数 Re来揭示流体流动的两种形态,当Re4000时,流动形态是______。
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