By means of moving frame, some properties of ruled surfaces are obtained, including the surfaces being minimal, totally geodesic, totally developableand totally umbilical. Some equivalent conditions in which the ruled surfaces are totally developable are obtained. It is abtained that (k+1)-dimensional ruled surfaces are totally geodesic if and only if they are minimal and totally developable.

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METHODS: CD44v6 protein was detected by SP immunohistochemical method in the tissues of rectal cancer, mesorectum (2 cm distal from the tumor), and distal mesorectal margin (5 cm distal from the tumor) from 47 rectal cancer patients received total mesorectal excision. RESULTS: CD44v6 was highly expressed in the tissues of rectal cancer.

行全直腸系膜切除術(shù)的直腸癌患者47例于直腸癌組織200毛片、直腸系膜（距腫瘤下緣2 cm）国产女人久久二级的毛片、直腸系膜遠(yuǎn)端切緣（距腫瘤下緣5 cm）取病理標(biāo)本，采用免疫組化SP法對標(biāo)本進(jìn)行CD44v6檢測色色色色鬼。

At same time it collects the pr essure signal of Servo-cylinder, it finds that the overflow valve pr essure sets too high between the servo valve and Rodless cylinder servo cavity, Tanks should not stress-free cavity under unloading, According to the fuel tank pr essure signal.

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And it is proved that a semiring S in ■°■l is a subdirect product of a member of ■° and a member of ■l if and only if the multiplicative reduct of S is a subdirect product of a group and a semilattice by using the concept of sturdy frame of type(2,2) algebras.

O∩■°■B和■∩■°■中成員的次直積分解，并利用&(2www日免费看，2)型代數(shù)的堅固構(gòu)架&的概念免费黄色网址一区，證明了半環(huán)S∈■°■l是■與■l中成員的次直積當(dāng)且僅當(dāng)S的乘法半群是群與半格的次直積。

The correlation analysis of chemical oxidation and vanadic oxidation methods also were made.Results The CV of determination total and direct bilirubin was 1.01%and 3.24%,between day was 1.58%and 2.31% respectively.

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The flowfield and performance of a centrifugal compressor was predicted and analysed, which was composed of a Krain's impeller and two types of vaneless diffuser specially: one was constant area vaneless diffuser and the other was the straight-wall. The results show that the efficiency of the straight-wall vaneless diffuser is obviously lower than that of the constant area, and a separate flow occurs nearby the exit of the centrifugal impeller with the straight-wall diffuser. However, the type of vaneless diffuser has little influence on the aerodynamics performance of the centrifugal impeller. Finally, it is suggested that the constant-area vaneless diffuser should be selected as the downstream extended area of the centrifugal impeller during the prediction for the centrifugal impeller.

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In the optical system of DVD pickup, the collimating system has very important function, and its performance has large effect on design of objective lens. The collimating system of optical pickup was designed and implemented; the performance of collimating system is very good proved by experimental result.

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Because of simple structure and easy fabricating, the cylindrical lenses have been used in many practical applications for beam collimating of LDs.

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