The results of field trial showed that 4 pesticides gave good control effect against wheat aphid, Macrosiphum avenae(F.
田间试验结果表明，四种杀虫剂对小麦蚜虫均有较好的防效。
Portrait mode chooses a large aperture (a small 'f' number) which will make the depth of field (the amount of your shot in focus) smaller.
人像模式用一个大光圈(f值小)，而让景深(清晰对焦的那部分)变小。
The f-stop, otherwise known as the aperture, determines your depth of field (the area in focus) and how much light can pass through the lens to reach the sensor.
f制光圈(或称光圈)决定相机的景深(对焦区域)以及有多少光能通过镜头到达传感器。
为什么要说F是一个梯度场？
We have three conditions, F= so our criterion -- Vector field F equals .
有三个条件，因此我们的标准，向量场。
And that is indeed going to be the curl of F. in practice, if you have to compute the curl of a vector field, you know, don't try to remember this formula.
这就是F的旋度，在实际应用中，如果你必须计算一个向量场的旋度，不要尝试记忆这个公式。
F I have my surface and I have my vector field f.
有一个曲面，还有一个向量场。
But it's a new vector field that you can build out of f.
这是一个新的向量场，可以用f来建立。
Say that f, our vector field is actually the gradient of some function.
也就是向量场f实际上是一个函数的梯度。
Note that -f is the input field separator defined by the predefined variable FS.
注意- F是由预先定义的FS变量所定义的输入域分隔符。
In this script, the field separator is specified within the code itself (by setting the FS variable), while our previous example set FS by passing the -f ":" option to awk on the command line.
在该脚本中，(通过设置FS变量)在代码中指定字段分隔符，而前一示例通过在命令行向awk传递- F “： ”选项来设置FS。
The default delimiter is the TAB, and the -f option is used to specify the desired field.
默认的分隔符是制表符，- f选项可以用来指定希望显示的域。
We want to know whether a given vector field with components P, Q and R can be written as f sub x, f sub y and f sub z for a same function f.
要看向量场,能否写成，其中f是同一个函数。
V/F converters are increasingly applied in measurement and instrumentation field as a method of signal conversion and processing.
在测量与仪表技术领域，V/F转换器作为一种信号变换和处理技术，应用日益广泛。
This paper discusses the feasibility of broadband matched field source localization in F-Lake with a single hydrophone.
研究利用单个水听器对宽带水下声源进行匹配场定位的可行性问题。
Its linear F-N curve shows the electron emission was field emission.
曲线呈线性关系证明电子发射确为场致发射。
Through scaling transform, field F and energy level E are replaced by parameter t.
通过标度变换，引入t参量代替能级E和外电场F。
In order to reconstruct the shape of scatterer d, we establish the relation between the scatterer and the far field pattern. The relation can be fixed by so called far field operator f.
为了能够重构散射体d，我们可以建立起远场模与散射体之间的联系，这种联系可以通过所谓的远场算子f来确定。
Thus in the field conditions, photodegradation plays a major role on the fate of PCDD/F and PAH adsorbed on spruce needle surfaces.
实验结果表明，在野外环境条件下，光解对于吸附到云杉针叶表面的PCDD／F和PAH的归宿起着重要的作用。
This paper discusses some canonical forms of similar matrices in a general field F, gives a kind of rational forms in the field and a similar transformation from it to Jordan form.
讨论相似矩阵的一些标准型，给出一般域F上矩阵的一种有理标准形式，提供它变到若尔当标准型的相似变换。
Different fertilizers were applied in the paddy field (variety F-2000) to observe their effect on diseases and insect pests, weeds and paddy yield.
以水稻品种F- 2000为材料，进行了施用不同肥料防治水稻病虫草害、提高产量的技术的研究。
By means of the bin, a comparative test of tractive performance between the wedged paddle wheels and nonrim ones ofpaddy-field tractor(P. F. T. ) is analysed.
此外，还分析了在该土槽上所进行的机耕船用楔形轮与无轮缘叶片轮的牵引特性的对比试验。
The compositions of S, F, Hg in soil near gangue pile in Laiwu coal field are higher than contrast point, but lower than background value of soil composition in Shandong Province.
莱芜煤田矸石堆附近土壤中的硫、氟、汞等成份比对照点偏高，但低于山东省土壤成份背景值。
Serum antibody of schistosomiasis patients was detected by dot immunogold filtration method(DIGFA)in laboratory and field, and F-ELISA was used as control.
应用建立的胶体金免疫渗滤法检测日本血吸虫病血清抗体，并以快速酶联免疫吸附试验（F-ELISA）方法检测作平行对照。
Serum antibody of schistosomiasis patients was detected by dot immunogold filtration method(DIGFA)in laboratory and field, and F-ELISA was used as control.
应用建立的胶体金免疫渗滤法检测日本血吸虫病血清抗体，并以快速酶联免疫吸附试验（F-ELISA）方法检测作平行对照。
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