assume 2 水泵 same . 1 , 流量 no be'coz second 水泵的入水 control by first 水泵的出水, so result should be similar to 1 水泵的出水量. 2 流量 yes,
what is the definition of 扬程 , any standard pipe size ?? for 2 if double pipe size , answer are no, if same pipe size no change , maybe answer are yes.