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Аннотация:We give new characterizations of spaces X which are kR-spaces or sR-spaces. Applying the obtained results we provide some sufficient and necessary conditions on X for which is a kR-space or an sR-space. It is proved that Cp(X) is a kR-space for any space X with one non-isolated point; if, in addition, |X| is not sequential, then is even an sR-space. Under CH, it is shown that there exists a separable metrizable space X such that Cp(X) is an Ascoli space but not a sR-space.