In the research of prescription, through the experiments we knew the influence from the Nb_2O_5 or Y_2O_3 single donor doped on high-temperature PTC ceramic, and got the curve graph drawing the resistivity and mixing quantity. In order to restrain lead volatilize and mix the rang of donors to neutralization the harmful acceptor impurity in raw materials, adopt the prescription design of Nb_2O_5 and Y_2O_3 double donors-doped. From the result, we know that regulation proportion of Nb , Y double donors, can make high-temperature PTC ceramics semiconducting, the pottery demonstrates good electric performance.

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On the basis of accurately calculating the parameters of formation water,the effects of these parameters on the effective porosities of rocks and the parameters of identifying gas reservoirs are emphatically analyzed.It is pointed out that in the strata containing salt-water,if the parameter values of pure water are used,the calculated effective porosities of the rocks and the calculated parameter values of identifying gas reservoir will be all reduced,which exerts a serious influence on the log recognition of gas reservoirs.

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However, the income gap results in demerit circular of the agricultural and rural economy, which dissatisfied rural citizen's basic demands, and delays and reists the development of rural market as a whole.

但城鄉(xiāng)差距擴大也導致了工農業(yè)和城鄉(xiāng)經(jīng)濟陷入了不良循環(huán)的境地免费久久视频，使農村居民的有效需求無法滿足亚洲视频第10页，農村市場難以有效啟動，從而制約了農村經(jīng)濟的進一步發(fā)展国产精品国产国产AⅤ。

The experiment result showed that this method can effectively eliminate image dithering and distortion caused by air disturbing,and the precision of measurement and measurement scale can be improved.

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Since floor device adopts activities, the principle of release compound needle effectively sealed off the yarn and hang sloughing function, and yarn clip and bottom shear device yarn device is complementary to each other, both with work, can fully play their due role, effectively reduce the waste of yarn, improve the production efficiency.

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The comb device adopt activity releasing theorem, which achieves the compose needle to pick up yarn or release yarn. The comb with clip and cutter is complement to each other, both to cooperate with each other. Which give full pay completely due action and reduce the waste yarn and increase the production efficiency.

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Its working principle is introduced here: when a gas or powder starts a flame or explosion, the ultraviolet sensor will acquire the signal and sent it to the controller to produce the trigger voltage, and then the explosive suppressor will release a great number of gas promptly spraying dry powder extinguishing agents, which thereby form extinguishing agent smoke and effectively extinguish explosion flame. It is rapid and of strong antiinterference ability, high reliability and can be fixed easily. It is capable of effectively suppressing natural gas explosion in the simulative gas explosion test. It can be applied in CNG stations or other site where has explosive and combustible gas whereby to enhance the overall accident control ability.

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Inwheat intercropped with soybean not only N situation could be improved butalso P situation could be.2In intercropping,the pH of soybean rhizospherewas decreased by increasing the R-Apase activity,which could decelerate thetransforming and fixing P fertilizer.3In both monoculture and intercroppingsystem,the soil pH of rhizosphere was affected by cropping system at two Plevel which only 0.1-4mm distance from the root surface,but the effect of S-Apase activity in the rhizospher soil by cropping system was less than3mm.In effect,the rhizosphere P was really available nutrient,and applyingP to rhizosphere was effective ways to reduce the P nutrient competition.4Inwheat/soybean intercropping,the peak stage of reduction ability of roots wasthe same as that of the root growth,so that the time compensation appearedin intensity of nutrient absorption.

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Vandierendonck,A.,'The contribution of working memory resources in the verification of simple mental srithmetic sums',Psychological Research,1999,62,72-77.% q! Y! l*~# y: ^ [5] Miyake,A.,Friedman,N.P.,Emerson,M.J.,Witaki,A.H.

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