短语词组短语water pipe head 水管接头Water -head 水头big water -head 高水位差water -head loss 水头损失large water -head 大水位差circulating water pump head 循环水泵扬程water column head 水柱高度water ray head 泡沫水两用喷雾头The Water Falls Head 低垂着头 返回 water head