单选题
1分
Before liquid can flow into a pump, the air in the suction line must be _____ sufficiently to cause ...
Before liquid can flow into a pump, the air in the suction line must be _____ sufficiently to cause the liquid to flow into the suction chamber.
参考答案: B
参考解析: 在液体流入泵,吸入管路中的空气必须排空足以使液体流入吸入室。 evacuate 清除,排空