查询词典 diameter

Liu Hui, a mathematician of the Three Kingdoms period, claimed that "3 to 1" was rather a ratio of the circumference of the inscribed hexagon with the diameter of the circle than a ratio of the circumference of the circle with the diameter.

刘辉说，数学家的三国时期，声称" 3比1 "是相当比例的周长与登记六边形直径的圆圈比比圆周长与直径。

The metric system for spur-gear calculations involves more than changing inches to millimeters .the basis for calculations in the American inch system is diametral pitch ,which is the number of teeth divided by the pitch-cirle diameter .In the metric-circle diameter by the number of teeth .

公制为spur-gear计算多变化，依据英寸到毫米的计算系统在美国英寸直径的球场，这是数量除以pitch-cirle直径的牙齿。metric-circle直径的牙齿。

Tooth Proportions.—There are 17 pitches: 2.5/5, 3/6, 4/8, 5/10, 6/12, 8/16, 10/20, 12/24, 16/32, 20/40, 24/48, 32/64, 40/80, 48/96, 64/128, 80/160, and 128/256. The numerator in this fractional designation is known as the diametral pitch and controls the pitch diameter; the denominator, which is always double the numerator, is known as the stub pitch and controls the tooth depth. For convenience in calculation, only the numerator is used in the formulas given and is designated as P. Diametral pitch, as in gears, means the number of teeth per inch of pitch diameter.

齿比——一共有17种齿比：2.5/5，3/6，4/8，5/10，6/12，8/16，10/20，12/24，16/32，20/40，24/48，32/64，40/80，48/96，64/128，80/160和128/256在这一系列的分数中的分子是径节，径节的大小决定了节圆的直径；而分数中的分母通常是分子的两倍，分母是残余径节，它的作用是控制齿槽的深度为了方便计算，在所有的公式中都使用分子作为计算参数，并且与齿轮的表示方式一样定义为径节P尺寸，也就是在节圆上，每英寸长度上的齿数

In order to analyze the influence of the center air pipe diameter change on the combustion effect, numerical modeling was applied to numerical calculation on the temperature field of such type of boiler,through which temperature field in five different schemes were obtained. In addition, the influence law of change of the diameter of the center air pipe on the temperature field was analyzed. The temperature of the nearly-back wall region takes on a firstly decreasing and then increasing change with the diametrical decrease of the central wind pipe.

为研究改变中心风管直径后的4层燃烧器对炉膛燃烧的影响，采用数值模拟的方法对该型锅炉炉内的温度场进行数值计算，得到5种不同方案下该型锅炉炉内的温度场分布，并分析了中心风管直径的改变对炉内温度场的影响规律，即后墙近壁区温度随着中心风管直径的减小呈现先降低后升高的趋势。

The wheat root diameter distribution and variation rule of side row and middle row diameter is basically consistent.

从各种参数比较，充分说明了边行根系的优势与地上部分的边行优势是一致的。

The fiber width increases all along,contrary to the fiber diameter and double wall thickness to diameter ratio.

枫杨纤维长度、宽度、腔径、双壁厚、长宽比、腔径比和壁腔比分别为1145um、26.9um、18.8um、8.1um、43.19、0.70和0.46。

Products not only applicable to high-volume small-diameter double-ended lead metal tubular components of civilian production, and it applies to large-diameter pipe production of industrial electric heating.

产品不单止适用大批量小管径的双端引线的民用金属管状元件生产，而且适用大管径的工业电热管生产。

The computer separately connects and controls the I/O end and A/D converter; the I/O end connects and controls the X, Y axis driving circuit and the semiconductor laser; the X, Y axis step-by-step driving circuit connects and controls the X, Y step-by-step electrical machines to control the dimensional platform; the beam of the semiconductor laser passes through the focusing drawtube with 0.1mm diameter to form the facula with the diameter less than 0.1mm; the facula irradiates on the detector surface of the XY dimensional displacement platform to produce the corresponding electric signals; the detector surface connects the A/D converter through the amplifier; the electrical signal is amplified and is converted into the data signal by the A/D converter and is sent to the computer for processing.

由计算机分别连接并控制I/O端口和A/D转换器，I/O端口分别连接并控制X、Y轴步进电机驱动电路和半导体激光器，X、Y轴步进电机驱动电路分别连接并控制X、Y轴步进电机，从而控制二维位移平台，半导体激光器的光束经过设有直径0.1mm小孔的聚焦镜筒形成＜0.1mm直径的光斑，光斑照射于设在XY二维位移平台上的探测器表面使其产生响应的电信号，探测器表面经放大器连接A/D转换器，电信号经放大器放大后，由A/D转换器转换为数据信号送计算机处理。

Detained the 1 mm diameter plastic tube or 0.8 mm diameter silicon lube in the lacrimal ductule for 3 months and followed up for 6 months.

留置管径1 mm塑料管或0.8 mm硅胶管，3月后拔管，随访半年。

In a spouted bed made of stainless steel with internal diameter 92 mm and height 1000 mm ,by adding five kind powder particle s through intermittent inlet samples, the powder elutriation with temperate air was studied by changing such parameters as bed temperature, bed height, bed particle diameter, spouting velocity, aerating velocity.

在一内径92mm，高1000mm的不锈钢充气喷动床反应器内，以三种不同直径的玻璃珠为惰性粒子，采用五种不同的粉末物料为微细粒子，以空气为充气和喷动气体对微细粒子进行淘洗，综合考察了设备结构，物性，以及操作方式等对充气喷动床内微细粒子的析出率的影响。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。