Making use of the linearity of system, the technique of obtaining the step force from step response is developed.

利用线性系统的特点，给出使用阶跃响应获取阶跃力的技术。

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Mr Napolitano may call on Mr Berlusconi to step down, but he cannot force him to do so.

纳波利塔诺可能要求贝卢斯科尼下台，但他无法强迫他这样做。

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Now let's do the next step which is a force balance.

现在我们进行下一步，假设。

麻省理工公开课 - 固态化学导论课程节选

One critical step the task force should embrace is to lift restrictions on the research public health scientists can do.

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"And the police force will step in for legal assistance, " he added.

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Russia, which supports Mr Assad, has refused to back US pressure designed to force him to step down.

BBC: Syria conflict: Envoy Brahimi hails US-Russia accord