按照压力容器器壁的厚薄可以分为()压力容器和厚壁压力容器。 ["轻型","小型","薄壁","大型"]
波形板分离器是怎样工作的?
国民资产负债统计的对象是按所有权确定的,对无法行使所有权的自然资源和环境要素,不能纳入国民资产负债统计的范围。
压力容器共分为()类。 ["3","4","5","6"]
锅炉燃煤中含量最多的可燃元素是()。 ["氧","氢","硫","碳"]
()(信不信由你), his discovery has created a stir in scientific circles.