單項(xiàng)選擇題地面直讀測(cè)取流壓梯度時(shí),要求每()記錄一個(gè)壓力溫度值,每個(gè)梯度測(cè)量時(shí)間不少于()。

A.10s,5min
B.20s,5min
C.30s,5min
D.30s,10min


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