n.活塞下降行程

A helical buckling of pumping rods has taken place in the course of downstroke of pumping. 認為抽油桿在下行沖程中可能因失穩(wěn)而在有限空間內(nèi)發(fā)生螺旋狀彎曲。

Both the upstroke and downstroke of this pump push air into your balloons, making for smooth, nearly effortless inflation. 這個泵浦向上的一擊和向下的一擊推擠空氣入您的氣球, 做為光滑, 幾乎不出力的通貨膨脹。

So, when a bird banks right, its left wing moves faster on the downstroke while the right is faster on the upstroke, which slows the animal’s rotation. 因此，當鳥兒向右側(cè)傾斜飛行時候，它的左翼向下拍打的速度要比右翼向上拍打的速度快一些，這樣就可以使旋轉(zhuǎn)減速。

The flow fields are different for the three phase motion patterns and there are two types of leading-edge vortex motion at an earlier stage of upstroke or downstroke. 三種相位下的渦流場形態(tài)各有不同，上揮（下拍）初期前緣渦的運動主要存在兩種形態(tài)。

According to the calculating equations of the friction load on the rod string on the upstroke and downstroke, the friction load increases remarkably with the increa... 孤東油田八區(qū)部分見聚油井摩擦載荷的計算值與實測值的實例對比表明,二者的數(shù)值差距很小,表明計算方法可行。