乙二醇脱水塔回流量减小，其它工艺参数不变时（）。
A、塔顶温度上升
B、塔顶温度降低
C、塔釜液位下降
D、能耗增加
参考答案：A
—Must I finish my homework at school?
—________. You can do it at home and hand it in next week. [ ]
A. Yes,you must
B. No,you needn't
C. Yes,you can
D. No,you mustn't
在堆取料机启动前你应做哪些检查？
