重数

Its primary coverage includes: Function and limit, derivative and differential, theorem of mean and derivative application, indefinite integral, definite integral and application, space analytic geometry and vector algebra, function of many variables differential method and application, multiple integral and curvilinear integral, infinite series, differential equation and so on.

其主要内容有：函数与极限，导数与微分，中值定理与导数应用，不定积分，定积分及其应用，空间解析几何与矢量代数，多元函数的微分法及其应用，重积分与曲线积分，无穷级数，微分方程等。

Nine super sweet corn inbred lines with abroad germplasm T1, T2, T3, M1, M2, M3, R1, R2, R3 were selected as tested lines, and original inbred lines B, C, D, 6, D2 as testing ones in this examination. 45 crosses were made by means of incomplete diallel method, and the genetic parameters of the groups and the combing ability of 10 traits, growth period, plant height, ear height, ear length, ear diameter, core diameter, baldhead length, rows per ear, kernels per row, single ear weight were tested and analyzed by means of NCⅡ design.

选用具有国外血缘的T1、T2、T3、M1、M2、M3、R1、R2和R3共9个超甜玉米自交系做被测系，以原有5个自交系B、C、D、6和D2做测验系，采用不完全双列杂交法组配出F1杂交组合45个，对生育期、株高、穗位高、穗长、穗粗、芯粗、秃尖长、穗行数、行粒数、单穗重10个性状按NCⅡ设计的原理和方法进行配合力测定与分析，并估算群体遗传参数。

This curriculum primary coverage includes: Function and limit, a circular function derivative and differential, theorem of mean and derivative application, indefinite integral, definite integral, definite integral application, space analytic geometry and vector algebra, function of many variables differential method and application, multiple integral, curvilinear integral and surface integral, infinite series, differential equation.

该课程的主要内容有：函数与极限，一元函数的导数与微分，中值定理与导数的应用，不定积分，定积分，定积分的应用，空间解析几何和向量代数，多元函数微分法及其应用，重积分，曲线积分与曲面积分，无穷级数，微分方程。

Irrigation during over-winter promoted significantly N absorption and accumulation, increased N content in the plants at early stage (before 10, April) and final single stem weight, and reduced stem flowering percentage and florets per cyme, leading to an improved quality of rush stem. With the increased level of N application, N content and accumulation in plants, stem flowering percentage and florets per cyme were significantly increased.

越冬期灌水能显著促进植株对氮的吸收和积累，增加前期（10/4前）植株含氮量和收获期单茎干重，显著减少草茎开花率和平均每花序小花数，从而改善草茎品质；随着施氮水平的提高，植株氮吸收和含氮量相应增加，开花率及平均每花序小花数显著提高。

The number a is called a double root of the polynomial function f.

数a称为多项式丞数f的二重根。

Track roller: Singe flange 4 Double flange 2 Carrier roller: 2 Idler 1 Type of track: single grouser combined Tension mode of track: hydraulic Pitch: 203 mm Number of shoes 38 pieces Width of shoe 500 mm Length of track on ground 2570 mm Sealed and lubricated track ▲▲The pitch , numbers and width of track shoes are the same with the general track.

支重轮 单边四个双边二个托链轮二个引导轮一个履带型式单履齿组合式履带涨紧型式液压涨紧节矩 203 mm 履带板数 38 块履带板宽 500 mm 履带接地长度 2570 mm 密封和润滑履带▲▲该履带的节距、履带板数、履带板宽与普通的履带相同。

It employs carbon dioxide as carbon source to replace traditional sugar, the concentration is controlled to be 2000- 3000ppm, takes light transmission, ventilating and water- proof fluoroethylene resin film as container, and gets tissue culture sprout and replanting sprout of chrysanthemum, which are characterized by largest plant height, largest leaf number, root number, longest root length and largest dry net weight of haulm and root, high rate of emergence and little pollution rate.

本发明提供了一种无糖培养菊花的方法，采用二氧化碳作为碳源，替代传统的糖，控制释放浓度为2000～3000ppm，采用透光性好、透气不透水的氟乙烯树脂膜为容器，在此种培养条件下，不同品种的菊花组培苗和组培后移栽苗在株高、叶数、根数、最大根长、茎叶部分和根部部分的干鲜重最大，出苗率高，污染率最低。

Under the condition [0mmol/L,raise in vermiculite] of phosphorus stress, variation in root morphology and biomass among different soybean genotypes at seedling stage were studied, the result shows: At two-leaf age, higher P-efficiency genotypes(K1 and K2) don't develop their potential advantages; at four-leaf age, some characteristics of K1 and K2, such as lateral root number, lateral root length, root absorbent area and dry weight of shoot are all less reduced than those of intermediate P-efficiency genotypes(Z1 and Z2) and of lower P-efficiency genotypes(M1 and M2), and dry weight of root and R/S of higher P-efficiency genotypes are more increased than those of the others.

在磷胁迫[0mmol/L，砂培]条件下，对不同基因型大豆苗期在根系形态、生物量等方面的差异进行了研究，结果表明：磷高效基因型在两叶期并未发挥出其基因型潜力的优势；四叶期，磷高效基因型的侧根数、侧根长、根系吸收面积、茎叶干重等性状的受抑制程度均显著低于磷中、低效基因型，而地下干重、根冠比却受到了较中、低效基因型更强的诱导作用。

The hydrogen isotopic composition of heavy hydrocarbon of natural gas is closely related with the sedimentary environments of source rocks.

即随着烃类碳数的增加而富集重同位素。同时天然气重烃的氢同位素组成也主要与源岩的沉积环境有关。

The intersection problem of simple directed triple systems with λ=2 is completely solved, namely, it is proved that for v ≡0,1 (mod 3), v ≥3,there exist two simple DTS( v ,2)s intersecting in s triple if and only if, s∈{0,1,2,…,2v(v-1)/3},s≠[2v(v-1)/3]-1, while v≥4 s∈{0,2,4},while v

解决了单纯二重有向三元系的相交数问题。即证明了对于任一正整数v≥3，v≡0，1（mod3），存在两个单纯二重有向三元系相交于s个公共区组的充要条件是：当v≥4时，s∈｛0，1，2，…，2v（v－1）／3｝，s≠［2v（v－1）／3］－1；当v＝3时，s∈｛0，2，4

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。