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单项选择题

A flower is made up of four concentric rings of modified leaves called whorls. Which of the following lists the individual whorls in CORRECT order going from the outside toward the inside of the flower?
A、 petals, sepals, carpels, and stamens
B、sepals, petals, stamens, and carpels
C、carpels, stamens, petals, and sepals
D、stamens, carpels, sepals, and petals
E、carpels, petals, sepals, and stamens

问答题

根据设计的气控系统回路图，组装与调试料斗门控机构气动系统。
请录制调试完成的气控系统操作过程与解说。
要求：解说气动回路图中各主要元器件，并操作运行气控系统使之按照控制要求完整运行至少一遍，最后口述完成的日期及完成人班级、学号、姓名等。然后将拍摄的视频上传。录制视频时间控制在1分钟之内。