Conclusion Fabricating complete metal occlusal pad, though the difficulty coefficient is big, is still a good dental clinical restoration method at present.
结论：制作全口金属牙合垫修复牙列磨损及缺失，虽然难度系数较大，但目前仍不失为一种良好的齿科临床修复方法。
METHODS:After the primary and additional factors related to technic difficulties in root canal therapy had been wholly considered, the formula for calculation the difficulty coefficient was set up.
方法：综合考虑根管治疗术中操作相关的基本因素和附加因素，设计了难度系数的计算公式。
Therefore, the difficulty coefficient of road administration is determined by calculating the group utility function based on the normalized weights, utility function of every expert and the indexes.
用归一化的专家权重、专家个人效用函数的权重以及标准化后的指标，计算群效用函数，即可确定公路路政管理难度系数。
Voltage Reference in the design, how to achieve high-precision, low temperature coefficient is a major difficulty.
在基准电压源的设计中，如何实现高精度、低温度系数是一大难点。
For scattering of a bounded acoustic beam from a liquid-solid interface, the principal difficulty comes from the treatment of tie plane wave reflection coefficient.
分析有限声波束从平面液-固界面上散射的困难主要发生在平面波反射系数的处理上。
This paper presented a mathematical model with the main controlling parameters of the main points of knowledge, coefficient of difficulty and the structure of test question.
以考查点、难度系数和题型为主要控制参数建立了组卷问题的数学模型，并给出了用遗传算法解决组卷问题的新方法。
Damped least-squares method can work successfully at a relatively poor initial value, and it can overcome the recurrence difficulty caused by the singular coefficient matrix.
阻尼最小二乘法在较差的初值条件下能有效运行，并能克服系数矩阵奇异时的迭代困难。
The difficulty in decomposing rational function into partial fraction is to fix the undetermined coefficient in partial fraction.
将有理函数分解为部分分式的难点就是确定部分分式中的待定系数。
About bookmark difficulty locations, the relationship between and within IRT models and RP values were compared by Spearman coefficient.
在书签难度位置排序方面， 本研究以实徵与模拟资料， 以斯皮尔曼相关系數进行相（不） 同IRT模式， 不（相） 同RP值之间的比较；
About bookmark difficulty locations, the relationship between and within IRT models and RP values were compared by Spearman coefficient.
在书签难度位置排序方面， 本研究以实徵与模拟资料， 以斯皮尔曼相关系數进行相（不） 同IRT模式， 不（相） 同RP值之间的比较；
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