皮皮学，免费搜题
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【单选题】
黏度计常数为 0.4780mm 2/ s 2,试样在 20 °C时的流动时间为 322.0s 、 322.4s 、 322.6s 和 321.0s ,此温度下的运动黏度为
A.
151.3mm ²／ s
B.
153.9mm ² /s
C.
156.7mm ² /s
D.
160.5mm ² /s
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