Realize the function of eight of flowing water light, first from left to right, each only light a led two lights, and then from right to left, reciprocatingcycle.
实现八个流水灯的功能，首先先从左到右，每次只亮一个发光二极光，然后再从右到左，往复循环。
2
A reciprocating piston, the inhalation and from a liquid, known as a working cycle; this pump known as the single-action pump.
活塞往复一次，各吸入和排出一次液体，称为一个工作循环；这种泵称为单动泵。
3
Mud pump Classification mud sub-single-effect and two types of double acting, single acting mud pump piston reciprocating in a cycle of action only to complete a suction drain.