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【多选题】
关于格拉晓夫数Gr的说法正确的是:
A.
Gr数表征了流体浮升力和粘性力的相对大小。
B.
Gr是判断自然对流和强迫对流相对强弱的判据。
C.
Gr数与流体体胀系数和运动粘度相关。
D.
Gr数是物性参数。
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