四冲程的

Because the two-stroke engine can develop twice the power of the four-stroke engine of the same size.

由于二冲程发动机的两倍，可发展的四个权力同样大小的冲程发动机。

The 9A-91 rifle is a gas operated, rotating bolt weapon, which utilizes a long stroke gas piston, located above the barrel, and a rotating bolt with 4 lugs.

在第9A - 91步枪是一种气体操作，旋转螺栓的武器，它采用了长冲程气体活塞位于枪管上方，并与四耳旋转螺栓。

The characteristic features of the long-stroke unit are the continuous adjustment of all four camshafts - by 52 degrees on the intake side and 42 degrees on the exhaust side - and the extremely narrow cylinder angle of just 15 degrees.

长冲程单元的特征是所有四个凸轮轴不断调整-由52进气侧和排气侧42度，-而只有15度，非常狭窄气缸夹角。

According to the limits from the standard which will be set - Limits and Measurement Methods for Smoke Emissions from Mopeds and Motorcycles, motorcycle samples were tested in our country, with the method of test for exhaust smoke under snap - acceleration conditions for motorcycles.

以即将制定的《摩托车和轻便摩托车排气可见污染物限值及测量方法》标准中的限值为依据，用急加速法对我国新生产摩托车和在用摩托车的排烟进行部分抽样检测，结果表明，四冲程摩托车的排烟通过率为100％。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。