Yes, the parallelogram objects have Order 2 rotational of symmetry. Parallelogram, is a type of quadrilateral having four sides, its opposite sides are equal and parallel to each other. A parallelogram provides a same view after its rotation.
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The recommended open shelf life for oxidation based. strips, chlorine/chloramine, peroxide or blood hemoglobin, is 3 months. For pH and water hardness strips, the open. shelf life can be extended to 4 months. One unique feature. about the chlorine/chloramine or peroxide test strips is that.