对角线的

Let A" denote the commutant of a bounded linear operator S on H and R denote the collection of all operators in A" which are compact and upper triangular operators with diagonal sequence being zeros. In this paper, we show that if A"= CI + R, the K_0-group of A" is isomorphic to the integer group.

本文指出若H上的有界线性算子S的换位代数A′=CI+R，其中C是复数域，I是H上的单位算子，R是所有与S可交换的对角线为0的紧上三角有界线性算子的集合，则K_0A′

The error source of CMM is complex, and the current main research is its geometric error. In the paper, 21 items of geometric error are measured accurately, simply and fast with the 2-D laser interferometer and four quadrants photo detector. The measurement gets rid of measuring so many lines and several diagonal lines in linear displacement method, and also solves the question that error measure of large-scale CMM can not be measured with 1-D ball array and ball plate conveniently.

坐标测量机的误差源纷繁复杂，当前主要研究的是其几何误差，课题中研究了一种采用二维激光干涉仪和四象限光电探测器相结合的测量方法，对三坐标测量机的21项几何误差进行了准确、简便、快速的测量，摆脱了线位移法测量直线过多且包含多条对角线测量的弊端，同时也解决了一维球列和球板不方便检测的大型测量机的误差检测问题。

Behind him I could see all the way down the narrow garden at the back of the house to the diagonal row of trees skirting the railway line-they are gone now, those trees, cut down to make way for a row of pastel-coloured bungalows like dolls' houses-and beyond, even, inland, to where the fields rose and there were cows, and tiny bright bursts of yellow that were gorse bushes, and a solitary distant spire, and then the sky, with scrolled white clouds.

在他的身后，沿着剧院后狭长的花园我能看到对角线排列的树那边的铁路线——现在没有了，那些树被砍倒了制作为那些蜡笔彩色的洋娃娃一般的小平房，甚至在内陆，在那儿有玫瑰园和奶牛，也有金雀花灌木黄色微亮的发光，一座孤单遥远的尖塔，然后就是天空，天空中卷着白色的云。

The water can be the center of interest in the image, or it can serve as an element in your composition—as a diagonal or other leading line, as a horizontal line, or as a shape that complements other elements in the frame.

宽广且流动缓慢的河流与山间水流湍急的小溪给人们的感觉是不一样的，流水可以做为画面的亮点，也可以在你的构图中充当铺垫-----作为一条对角线斜穿画面，或者作为其它的构图线条，或者作为一个水平线，也可以作为一个图案突出构图中其它景物

A big, slow river looks and feels different from a fast-moving mountain stream. The water can be the center of interest in the image, or it can serve as an element in your composition—as a diagonal or other leading line, as a horizontal line, or as a shape that complements other elements in the frame.

宽广且流动缓慢的河流与山间水流湍急的小溪给人们的感觉是不一样的，流水可以做为画面的亮点，也可以在你的构图中充当铺垫-----作为一条对角线斜穿画面，或者作为其它的构图线条，或者作为一个水平线，也可以作为一个图案突出构图中其它景物。

This diagonal is not a straight segment line but a small lozenge (diamond-shaped figure), whose acute angle is

这个64=65的几何谬论源自于四块图形的边，它们拼起来的长方形的对角线不是直线的，是一个菱形，它的角度是

In this note, we show that for any two matrices A and B over a generalized quaternion algebra defined on an arbitrary field F of characteristic not equal to two, if A and B are similar and the main diagonal elements of A and B are in F, then their traces are equal.

本文对于特征不是2的任意域F上定义的广义四元数代数上的两个矩阵A和B，给出如果A和B相似并且它们的主对角线上的元素在F中，那么它们的迹相等。

In this note, we show that for any two matrices $A$ and $B$ over a generalized quaternion algebra defined on an arbitrary field ${\bf F}$ of characteristic not equal to two, if $A$ and $B$ are similar and the main diagonal elements of $A$ and $B$ are in $\bf F$, then their traces are equal.

本文对于特征不是2的任意域${\bf F}$上定义的广义四元数代数上的两个矩阵$A$和$B$，给出如果$A$和$B$相似并且它们的主对角线上的元素在${\bf F}$中，那么它们的迹相等。

This approach is base on the following idea:under not effect to the deformation of rectangular pipe,to change right angle to obtuse angle which is variant as some regular,make plain-barreled roll pass receive vertical roll shape pipe blank,and then let pipe blank entering into vertical roll pass.With continuous deformation, the difference between diagonal line of rhombus pass will be reduced to zero,finally changed into a square.

该方法的基本思路是：在不影响方矩形管变形的前提下，通过将孔型顶角由直角改为按一定规律变化的钝角，让呈卧菱形状的平辊孔型接纳呈立菱形状的管坯，接着让卧菱形状的管坯进入立菱形状的立辊孔型，随着变形的继续，逐渐缩小菱形孔型对角线之差直至为零，成为正方形。

If many forces are acting simultaneously in different directions on any body, the direction of its motion will not correspond with any one of the forces, but will always follow a middle course, the summary of them, what is expressed in mechanics by the diagonal of the parallelogram of forces.

如果同时有许多各种不相同的力作用于某一物体，该物体运动的方向不可能与任何一个力的运动的方向相符合；而总是平均最短的方向，即力学所说的平行四边形的对角线。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。