电子轨道衡一般由称重台面、称重传感器、测量和（）三大部分组成。
参考答案：数据处理
顶水主要是运输物料，其用量的大小直接决定了物料在跳汰机中的分选时间和分选效果，另外顶水还起到湿润原煤的作用。
--- Tommy is planning to buy a car.
--- I know. By the time he returns from abroad, he ________ enough for a used one.
A．will have saved
B．saves
C．had saved
D．will save
