Questions Which one of the following substances is a liquid fuel used in rocket engines? More Videos Which one of the following substances is a liquid fuel used in rocket engines? a. Potassium perchlorate b. Liquid oxygen c. Ammonia d. Codium nitrate Answer : b. Liquid oxygen Related posts: Opening in a wall to let in air or light Which of the following requires the action of a first class lever in the body? A library’s online catalog is a computerized index of When you approach an empty parking space, _________________. Which one of the following choices best represents an advantage of cardiorespiratory fitness? Related Topics: Up Next Which sentence describes a legislative referendum? Don't Miss Which of the following statements best describes chemical weathering? 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