作物种植 - 2026 进行中

科目: 作物种植
级别: IX
类别: 大学生
测试题目: 英语
问题示例: A crop has a base temperature of 8°C. During four days, the mean air temperatures are 14°C, 20°C, 6°C, and 18°C. What thermal time accumulates over this period? 30 degree-days, 38 degree-days, 36 degree-days, 44 degree-days