23. The way the guests_____in the hotel influenced their evaluation(评价) of the service.

A．treated

B．were treated

C．would treat

D．would be treated

某电脱盐罐，其水底直径为3×10-3，水、油密度分别为998、822Kg/m³，油的粘度为2.1m²/s，则其水滴沉降速度为（）m/s。

A.1.67×10-4

B.5.0×10-7

C.9.0×10-3

D.7.83×10-5