To the rear of the house, beside the rusted water pump, two steel doors in the ground were secured with an old switch lock.
小屋后面，生锈的水泵旁边，两扇上了锁的铁门躺在地上。
The hand-held asphalt-spraying device includes a nozzle, the rear end of which is connected with an asphalt pump via a hose and the front end of which is provided with a spray head.
该装置包括有一个喷 管，喷管的后端通过软管与沥青泵连接，喷管的前端安装有喷头。
Maintenance difficulty is different, vertical pump maintenance is difficult, such as repair impeller should be the upper can all move to the rear;
维修难度不同 ， 立式三螺杆泵检修难度大 ， 如检修叶轮需将上部全部移去后方能进行 ；
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