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28 июня 2017 года выберраны заданиябыванияа вопросы, ответы дад ддаются 6 балддам(последдннне 1дднн день ответа не оценивается, спасидднн за ответ

2017-06-28View Original

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Однн вариант ответа(错误得0 бал点) �рстe升降式止回阀的阀瓣一般为( A )。 A、 盘形 B、 圆锥流形 C、 长形 D、 圆柱形

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