可作...用

In this paper,the B-spline curve is supposed as boundary curves,when they are in two paralled plane and two arbitrary plane,the condition about the control vertex of characteristic polygon when the ruled surface is developable are gained,solved the designing problem of degree and degree B-spline curve .Throughing (2,3) degree and (2,2) degree B-spline ,we haveproved the validity and utility of this method.

本文用两条B样条曲线作边界曲线，当它们位于两平行平面上和两任意平面上时，研究得到了由它们形成的直纹面为可展面时它们的特征多边形顶点满足的条件，解决了(n，n+1)次和次可展B样条曲面的设计问题，然后以(2，3)次和(2，2)次B样条曲面为构造实例，证明了该算法的正确性和实用性。

It becomes difficult to ascertain whether or not a character is a delimiter or a data item, and by using a printable character such as a colon as a delimiter, you are limiting the number of allowed characters in your data, which may not be desirable .

用可打印的字符串比如冒号来作定界符，将会很难分辨一个字符到底是数据还是定界符。而且还会限定你能用在数据项里面的字符数量，而这不是你想要的。

Pack is applicable to any body of animals, especially wolves, or of birds, especially grouse,and to a body of hounds trained to hunt as a unit.It also refers disparagingly to a band or group of persons.

Pack 适用于狼或鸟群等任何兽群，尤指松鸡，还可指一群作为一个整体训练以作打猎用的猎狗，也可指对一帮或一群人的蔑称。

And these results of some main conditions from carrier flotation have been compared, the results show that the recovery of fine grained gold have been increased by applying sulphonating kerosene as a subsidiary collector,at the same time, it also decrease the consumptions of xanthate and No.

对某高泥化高氧化铁锰黑土矿中的金进行了试验研究，试验采用黄铁矿作为载体有效回收了黑土矿中的金，并对载体浮选的几个主要条件进行了对比，结果表明用磺化煤油作辅助捕收剂可增加细粒金的回收，同时也降低了黄药和2#油的用

ML/min,the end of reaction(pH=7).These precipitates were then peptized with peptizator HAc at 80 ℃ for 12 h. So a stable transparent colloidal sol was obtained.By using this sol,splinterless La2O3-Al2O3 membranes were prepared.

mL/min、反应终点(pH=7)，加入HAc作胶溶剂，于80 ℃恒温胶溶12 h，可制得稳定、透明的溶胶，用该溶胶可制得无开裂的La2O3-Al2O3膜。

of programming design and manual operation trapeziform figure in system of numerical control lathe Corresponding project to problems is provided synchronously.

可编程控制器在机械制造的设备控制中应用非常广泛，通常用来实现逻辑控制和顺序控制，在普通车床数字化改造中，用PLC作数控系统的核心部件是一个新的课题。

Results show that when ammonium molybdate is used as coloring agent and color the coating after it was nickel plating, different kinds of colors can be obtained by controlling the processing parameters with the unaltered wear and corrosion resistance.

结果表明：用铂酸铵作着色剂，并采用先镀镍，后着色的工艺，通过控制着色处理的工艺参数，可获得不同的色彩，并可保持镀层原有的耐磨、耐蚀性能。

If the progress of the solvent front is monitored closely, itis also acceptable to draw start and stop lines on the plate before the chromatogram is run (A pencil should be used because ink is soluble). This prevents inaccuracies that occur when the solvent evaporates before the final solvent front can be marked. Sketch the chromatograms in your lab notebook.

如果要密切监测溶剂前沿前进过程，可在进行层析前可以先把起始线和终止线先标上，这方法是可以接受的(应该用铅笔，因为墨水是可溶解的)这样的话可以避免由于溶剂前沿在被作标记前已挥发掉所引起的不准确度。

If the progress of the solvent front is monitored closely, itis also acceptable to draw start and stop lines on the plate before the chromatogram is run (A pencil should be used because ink is soluble). This prevents inaccuracies that occur when the solvent evaporates before the final solvent front can be marked. Sketch the chromatograms in your lab notebook.

如果要密切监测溶剂前沿前进过程，可在进行层析前可以先把起始线和终止线先标上，这方法是可以接受的(应该用铅笔，因为墨水是可溶解的)这样的话可以避免由於溶剂前沿在被作标记前已挥发掉所引起的不准确度。

In the technology of the mobile air conditioning room,the heat barrier is used to isolate work- ers from the hot environment and the cooling air is supplied for the mobile air-conditioning room by the turbine- typed air cooler whose cooling source and ventilating power come from cooling energy and potential energy stored in the water in constant temperature zone.

矿井移动空调室技术的实质是利用热幛将作业者与环境隔离，再用一种水轮机式空气冷却器向移动空调室内供冷。水轮机式空气冷却器的冷源和通风动力均来自矿井恒温带。通过实验得知：环境温度为32℃时，以1.6 m~3/h的速度供给水温为18℃的冷水启动空气冷却器10 min后，矿井移动空调室内干球温度可降至24℃；空气冷却器停止工作后30 min，矿井移动空调室内的空气温度仍可维持在28℃以下

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。