在有杆泵抽油过程中，因油管弹性伸缩，抽油泵冲程损失达10%以上。
During oil recovery by rod pump, owing to the elastic stretching and shrinking of the tubing string, the stroke loss of the subsurface pump reaches 10%.
二冲程汽油机具有升功率大、机械损失小、结构简单、制造成本低以及便于维修等特点。
Two-stroke engine has its intrinsic advantages in terms of high specific power, compactness, light weight, low cost, etc.
二冲程汽油机具有升功率大、机械损失小、结构简单、制造成本低以及便于维修等特点。
Two-stroke engine has its intrinsic advantages in terms of high specific power, compactness, light weight, low cost, etc.
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