您永远都必须为每一个选择性参数提供预设值。
You must always supply a default value for each optional parameter.
选择性参数必须是参数清单中的最后一个参数。
Optional parameters must be the last parameters in the parameter list.
所有必要的参数都必须位在每个选择性参数之前。
All the required parameters must precede every optional parameter.
这个选择性参数可用于指定识别讯息目的的URI。
This optional parameter can be used to specify the URI that identifies the intent of the message.
程序定义中的每一个选择性参数都必须指定一个预设值。
Every optional parameter in the procedure definition must specify a default value.
如需选择性参数的清单，请参阅预先定义的自订精灵符号。
For a list of optional parameters, see Predefined Custom Wizard Symbols.
这个档案含有两行标题，后接要传递给精灵的不同选择性参数。
The file contains a two-line header, followed by various optional parameters to be passed to the wizard.
限制型别参数只接受参考型别，或者不要在选择性参数中使用它。
Constrain the type parameter to accept only a reference type, or do not use it for the optional parameter.
在程序定义中，每一个跟在选择性参数之后的参数也必须是选择项。
Every parameter following an optional parameter in the procedure definition must also be optional.
您可以定义多个选择性参数，但是所有选择性参数必须位在参数清单的结尾。
You can define more than one optional parameter, but all the optional parameters must be at the end of the parameter list.
当程序定义选择性参数时，可能需要判断呼叫程式码是已经提供对应的引数，还是省略引数。
When a procedure defines an optional parameter, it might be necessary to determine whether or not the calling code has supplied the corresponding argument or omitted it.
如果IN列表中包含参数标记符或主机变量，使优化器不能使用编目统计信息来确定选择性，就会出现这种情况。
This can occur if the IN list contains parameter markers or host variables which prevent the optimizer from using catalog statistics to determine the selectivity.
理论上分析可以得到，这两个参数不受外部故障和励磁涌流的影响，因此具有很好的选择性。
It is found that the two parameters aren't influenced by external fault and magnetizing inrush current, which ensures good selectivity.
集中供冷系统仿真数学模型的主要特点是压缩机可以根据蒸发器总负荷大小选择性开关不同的档位，相应的输入输出参数也随之改变。
And the capacities of compressor could be selected by on-off switch along with the change of burthen of evaporator, which is a main characteristic of the central refrigeration system model.
本文详细介绍了应用d C s对液化气吸收塔的工艺参数实现选择性控制的原理和方案，以及现场仪表的选型和实施。
The principle and scheme of selective control on process variables of LPG absorbing tower by use of DCS is explained in detail, including the selection and implementation of field instrument.
重要的是根据故障特征整定继电器的参数，既保证区外故障时的选择性，又在区内故障时获得足够的灵敏度。
It is important to set the parameters of the relay according to the fault characteristics. Thus the relay will get selectivity and sensitivity.
本文首先讨论了移动通信信道的各种参数对信道估计的影响，介绍了频率选择性信道的抽头延迟线模型和分集接收技术，在此基础上阐述了RAKE接收机的原理。
The tapped delay model of the multi-path frequency selective fading channels as well as the diversity receiver technique is introduced, and the principles of RAKE receiver are described.
本文介绍一种将微波低频段分布参数电路与超微细薄膜工艺结合的微型化、低噪声、高选择性的放大模组。
This module of distributed parameters used in the lower microwave band is skillfully combined with an ultra-fine thin-film technology.
本发明在选用现有的催化剂，反应参数一条件下，系统控制更加容易且不影响反应的选择性和收率。
Under the condition of selecting existent catalyst and reaction parameters said invention can make the system control be more easy and the selectivity and yield be unaffected.
如上所述，编辑器和建立游戏也能在启动时选择性的提供额外的命令和信息。这是使用下面的命令行参数。
As mentioned above, the editor and also built games can optionally be supplied with additional commands and information on startup. This is done using the following command line arguments.
研究结果表明：同一树种不同染料染色，色度学参数相差较大，染料渗透深度也有很大差异，不同染料对木材染色具有选择性。
Result showed that chroma parameter and penetration depth of the same kind tree dyed with different dyestuffs which were selective to wood had a great discrepancy.
介绍选择性激光烧结及烧结技术的基本原理，探讨了树脂基复合成型材料选择性激光烧结工艺及参数。
The basic theories of selective laser sintering and its sintering technique are introduced, and the sintering process and parameters of the resin-based prototyping composites are discussed too.
试验按跳甲数量和跳甲取食时间设置级别，分别测试了小菜蛾取食面积、生长发育和产卵选择性等参数。
We examined the parameters of feeding area, the growth and the oviposition preference of DBM after setting the levels by the number and feeding time of SFB respectively.
实验采用铜电极和不锈钢电极分别考察了输入电场峰值电压和甲烷、氢气进料流量等参数对甲烷转化率和碳二烃收率、选择性的影响。
Effects of peak electric voltage and feed flow rates of methane and hydrogen on CH4 conversion, C2 yield, and the selectivity were investigated using copper or stainless steel electrode.
目的观察不同参数的竹红菌乙素-光动力学疗法（HB-PDT）对青紫蓝兔脉络膜毛细血管层的生物学效应以及对视网膜的非选择性损伤，为临床应用HB-PDT疗法治疗脉络膜新生血管（CNV）提供依据。
Objective To compare the biological effects of different treating parameters of HB-PDT on choroid and retina and to supply the basic study of HB-PDT in treating choroidal neovascularization (CNV).
您可以将程序参数指定为选择性的，以便在程序码呼叫程序时，呼叫程序码不必提供引数给它。
You can specify that a procedure parameter is optional, so that the calling code does not have to supply an argument for it when it calls the procedure.
对于强制和选择性引数而言，对应的属性和建构函式参数应使用相同的名称，但大小写不同。
For mandatory and optional arguments, the corresponding properties and constructor parameters should use the same name but different casing.
对于各种粉末材料在选择性激光烧结成形过程中温度场的模拟与预测，是合理选择其烧结工艺参数的基础。
The simulation and prediction of sintering temperature field in SLS process play a basic role in determining the optimal processing parameters for different powder materials.
运用相似原理，采用模拟放大方法，科学地确定了浮选机主要结构参数和动力学参数，研制成功了振荡分离高选择性浮选机。
With a simulation principle and simulation enlarged method, the paper scientifically selected the main structural parameters and dynamic parameters of the floatation machine.
运用相似原理，采用模拟放大方法，科学地确定了浮选机主要结构参数和动力学参数，研制成功了振荡分离高选择性浮选机。
With a simulation principle and simulation enlarged method, the paper scientifically selected the main structural parameters and dynamic parameters of the floatation machine.
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