负

The paper points out the defects of the const pressure wave velocity method and do some improvements on it rebuilding the expressions of the pressure wave velocity in accordance with the Simpson's rule.

指出了常负压力波波速定位方法的局限性，并采用改进的负压力波定位技术，将管道内的负压力波速公式采用复化辛普森公式进行了改造。

By synchronizing the grid voltage vector with positive sequence, the improved synchronous reference frame method is very simple without the phase locked loop and calculations for sinusoidal function.

通过利用幅值积分信号的选频特性，本文提出了正序、负序基波提取器，该正序、负序基波提取器具有对电网基频偏差不敏感、适用于电压的正序和负序基波分量准确提取的优点。

In Scramjet, the evaporation of most liquid fuel occurs under the subnormal pressure condition. However, it is rarely seen in the existing documents about the study of the evaporation and combustion of the fuel droplet at subnormal pressure. This thesis gives the experimental and theoretical study about that.

在超燃冲压发动机的燃烧室中，液体燃料的蒸发大部分是在一个负压环境下完成的，现有文献对负压环境下燃料液滴蒸发和燃烧过程的研究却很少，本文对负压环境下燃料液滴蒸发过程进行了试验和理论研究。

The temporal and spatial distribution of SMP in tomato root zone and the correlation between tomato evaportranspiration and SMP variations were analyzed. The results showed that the variation of SMP among the soil profiles of 0, 15 and 30 cm from drip tape was insignificant, and the horizontal distance of tensiometers to drip tape had little effect on the correlation between tomato ETa and SMP variations. Lateral depths significantly influenced SMP from 20 to 70 cm soil layer and there were obvious effects of tensiometer depth on the correlation between tomato ETa and SMP variations.

对番茄根区土壤基质势时空分布和番茄耗水量与土壤基质势变化的相关性分析表明，水平距毛管0、15和30 cm 3个剖面间土壤基质势差异较小，负压计距毛管的水平距离对耗水量与土壤基质势变化的相关程度影响不大；毛管埋深对20～70 cm土层土壤基质势影响显著，负压计埋置深度对耗水量与土壤基质势变化的相关性影响显著，应依据毛管埋深确定负压计适宜埋置深度。

However, the lightning types and the characteristics of lightning behavior in one thundercloud may differ from those in another.

有些雷暴没有负地闪，而有些雷暴过程中却有负地闪；有些雷暴中的负地闪全为C型，有些则既有C型，又有P型。

The Simpson and Shannon-Weiner indices of aquatic plant diversity were both significantly positively correlated with catalase, protease and invertase, and negatively correlated with urase, soil organic matter and total nitrogen. Similarly, soil organic matter and total nitrogen were negatively correlated with catalase, protease and invertase but positively correlated with urase.

植物α多样性指数(辛普森、香浓-维纳指数)与湿地土壤有机质、全氮含量呈负相关，与土壤过氧化氢酶、蛋白酶、蔗糖酶活性呈正相关，与脲酶活性呈负相关；土壤有机质、全氮含量与过氧化氢酶、蛋白酶、蔗糖酶活性呈一致负相关，与脲酶活性则成正相关。

Or negative pressure operation may be the system of negative pressure vacuum relief valve which tends to be used.

负压或操作过程中可能会产生负压的系统一般用真空负压安全阀。

Or negative pressure during operation may produce negative pressure systems are typically used vacuum relief valve.

负压或操作过程中可能会产生负压的系统一般用真空负压安全阀。

Or negative pressure during operation may have negative pressure systems generally use vacuum relief valve.

负压或操作过程中可能会产生负压的系统一般用真空负压安全阀。

And water board press paper ball at the edges: transmission and paperboard paper before syndiospecific back, the value of paper paper ball should leave the edges, but sometimes paper aglaonema'silver queen'under sected size is too large, which results in a press paper ball edges.

负纸不活压纸球压着纸边：负纸不活上的纸弛出去后规后，负纸不活压纸球答当挨近纸边，但有时纸弛栽切尺寸太不小，而导致该压纸球压着纸边。

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。