These quantities are not perfect differential.

这些量不是全微分。

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It shows that the differential focussing method by comparing MTFs has perfect performances high speed, high precision focussing, not being affected by image displacement and flexibility etc.

实验表明，差分式对比传递函数法调焦，具有调焦精度高，调焦速度快，受像移影响不明显，适应性好等优点。

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Numerical method of integral order ordinary differential equation, for example, Euler method, linear multiple step method, and so on, has had quite perfect theories.

对于整数阶常微分方程的数值解法，如欧拉法、线性多步法等都已有较完善的理论。

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Not only must investors regard assets in different countries as perfect substitutes, but expected changes in exchange rates must also equal the expected inflation differential between two countries.

ECONOMIST: Capital goes global

If investors see British and American bonds as perfect substitutes, then the expected movements of their currencies against one another should equalise the differential between their interest rates.

ECONOMIST: Capital goes global