иметь место

. бывает; если это так; наблюдаться; происходить; существовать

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The minimum value of t_d occurs when Eqs. (3-7) and (3-7) are equal.

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A similar situation exists (or prevails, or obtains, or takes place) with regard to the total content of ...

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Under certain conditions this actually is the case.

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This is not always the case.

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These ultraviolet effects occur at about 0.3 μ.

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The year 1959 saw a marked improvement in the world freight position.

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The last quarter of the year showed a sharp increase in ...

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A similar relation holds for the frequency of the heart beat.

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The following relationships are true (or hold true, or hold good, or hold, or are valid).

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Mass transfer is involved whenever a chemical reaction takes place.

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The last few years have seen the first steps into the new territory of ...

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At low pressures, second-order kinetics obtain.

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Equation (.1) holds throughout the flow.

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Such a reaction occurs not only with aldose but also with ketose sugars.

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Иметь место -- to take place, to exist, to occur, to be in evidence; to be the case

 In main tunnels, these events take place at high speeds.

 A special case exists for a = 0.

 The maximum torque occurs when q = 45 deg.

 It is normal to observe concentrated fatigue in applications where severe roller skew forces are in evidence.

 This was the case in all of the tests summarized in this paper.