第8题:[单选题] When cleaning a tank by the Butterworth process,you should begin to pump out the slops ______. A.At the end of the drop schedule B.When the process is started C.When the process is finished D.When the tank is clean 参考答案:B 【参考译文】当使用巴氏洗舱机洗舱,程序启动时,你应开始向外泵污水。 【解 析】Butterworth巴氏洗舱 slop污水、泥浆