题目

如图中的物体A的长度是______cm。 答案：【答案】1.90【解析】刻度尺读数时要注意它的分度值、物体与刻度尺对齐的位置，要估读到分度值的下一位．图中刻度尺的分度值是：1mm；物体A的长度是：4.90cm−3.00cm=1.90cm；故答案为：1.90._____ you put your heart into your study, you'll feel _____ in it. [     ]A. If; interesting B. Once; interested C. Since; interested D. When; interesting