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It is proved that there is no Lorentzian isoparametric hypersurface of type IV in, which generalizes the relative result of Lorentzian isoparametric hypersurface of type IV in due to M. Magid.

Magid在洛伦兹空间R(上标 n+1 下标 1)中的有关结果推广到S(上标 n+1 下标 1)中，证明S(上标 n+1 下标 1)了中不存在Ⅳ型洛伦兹等参超曲面。

For k≥3, we show the infimum of α is 0 and adduce the G(superscript 1,s subscript k+1) graph is which causes α=0; using the foregone conclusion we characterize the G(superscript 1,s subscript k+1) graph which has a k-role assignment.

本文证明了k≥3时，a的下确界为0，并证明了当图G(上标 1，s 下标 k+1)图且a(s+1)≠0(mod k+1)(a=2，3，4)时，α达到下确界；最后还刻画了能够(n-1)-角色分配的G(上标 1，s 下标 n)图。

In the same way, a Four-coloring of a maximal planar graph of 25 order G(subscript M25), is obtained with "simplified method of reduction of order".

利用"简化降阶法"对一个一定拓扑结构的12阶最大平面图G(下标 M12)进行着色，得到G(下标 M12)的四色着色方案；以同样的方法对一个一定拓扑结构的25阶最大平面图G(下标 M25)进行着色，得到了G(下标 M25)的四色着色方案。

The limit of detection(S/N=3) of phosethyl Al, chloride, phosphate, sodium, phosphate were 15, 3, 12, 6, 5μgL^(-1) respectively.

三铝、Cl、HPO(上标 2-下标 3)、SO(上标 2-下标 4)、PO(上标 3-下标 4)的检出限(S/N=3)分别为15、3、12、6、5μgL^(-1)。

Objective: To establish a new method for quantitative detection of inorganic anion in water including fluoride, chlorite, bromate, chloride, nitrite, bromide, sulfuret, chlorate, sulfite, nitrate, phosphate, sulfate. Methods: Ion chromatography was applied.

目的：建立能同时测定生活饮用水中F、ClO2、BrO3、Cl、NO2、Br、S(上标 2-)、ClO3、SO(上标 2-下标 3)、NO3、PO(上标 3-下标 4)、SO(上标 2-下标 4)等12种无机阴离子的方法。

The results of the meristic characters about the two species indicate that body length/body depth, body length/head length, head length/snout length and head length/eye diameter exhibited wider ranges compare with the previous recordations.

石鲽的体长L(下标 B8与体高D(下标 Ba之间的关系D=0.3250L+2.3263(r=0.7329)；体质量W(下标 Bs，g和体长L(下标 Bs，cm之间的关系W=0.2559(上标 2.1238) L (r=0.8138)。这两种鱼的可量可比性状：体长／体高、体长／头长、头长／吻长和头长／眼径的比值范围比原来研究记载的更加宽泛。

The equations of heterosis areV(subscript F1)=(l/2)Na^2+(l/4)Nd^2+Vsubscript I(F1additive dominance F1 epistasisV=(1/2)Na^2+(l/2)V1,additive parental epistasisV=(1/4)Nd^2+Vsubscript I(F1+(1/2)Vl,dominance F1 epistasis parental epistasis.where N is number of genes controlling a trait,α=P(subscript i-P/2, d is deviation from midparent, while the variance components are all indicated by their names under the repective terms.

由一个二项分布随机变数及其推广至多项分布推导出杂种优势的公式：V(下标 F1)=Na^2/2+Nd^2/4+V下标(F1加性显性 F1上位V＝Na^2/2+V/2加性亲代上位V＝Nd^2/4+V下标(F1+V/2显性 F1上位亲代上位在此N=控制性状的基因数，α=p(下标 i-P/2， d=离中亲的偏差，而各方差则如方程底部所列。

With diluted anaerobically pretreated wastewater from a pig farm and Spirodela oligorrhiza, TN, NH(superscript + subscript 4)-N and NO(superscript – subscript x)-N removal pathways in shallow-water duckweed-based wastewater treatment systems were studied in summer and winter.

以稀释的猪场厌氧污水为供试水样，少根紫萍为供试生物材料，对夏、冬2季浅水体浮萍污水净化系统TN、NH(上标+下标 4)-N和NO-N（NO(上标–下标 2)-N与NO(上标–下标 3)-N之和）的去除途径进行了试验研究。

The results showed that net photosynthetic rate P(subscript n, transpiration rate T(subscript r, stomatal conductance G(subscript s, intracellular concentration of CO2 C(subscript i, water use efficiency of cultivars and the light saturation point in leaves of 5 cultivars were different and had obvious differences, and the light compensation point was similar. Diurnal change of net photosynthetic rate among cultivars were different, three cultivars showed twin-peaked curve with an obvious midday-depress, others showed single peak curves.

结果表明：不同品种的净光合速率P(下标 n、蒸腾速率T(下标 r、气孔导度G(下标 s、胞间CO2浓度C(下标 i、水分利用率和光饱和点之间的差异明显，各品种的光补偿点均较低；净光合速率的日变化也存在明显的品种间差异，有3个品种呈&中午降低型&的双峰曲线，2个品种呈单峰曲线。

With the tunablity of microwave frequency, the sidebands was thus tunable, providing great convenience for pure rotational spectroscopy.

利用该谱仪观测了CHF3振动基态J=34~33，K=0~15和SO2基态的19(下标 4，16)~18(下标 3，15)，38(下标 2，36)~37(下标 3，35)纯转动光谱，并对它们进行了标识。

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。