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翻开新鲜出炉的2013年版9年级物理教科书(人教版),嗅着淡淡的油墨香,扑面而来的感觉是:图片丰富多彩.多数图片采用彩色印制,比旧版教科书中的图片更清晰、更精致、更能吸引学生的阅读兴趣.在欣赏这些精美的图片同时,笔者也发现了几幅图形稍显不当,特此提出修改意见.第108页图19.1-9乙表示的电路与实际不相符合(如图1).通常,发光二极管的工作电压范围为1.8V到2.5V,[1]而不能直接接在220V的家庭电路中.所以,在
Open the freshly baked 2013 edition of the 9th grade physics textbook (PEP), smelling a touch of ink incense, blowing the feeling is: rich and colorful pictures Most of the pictures printed in color, the pictures than in the older textbooks more clearly , More refined and more attractive to students reading interest in the appreciation of these beautiful pictures at the same time, I also found that a few figures slightly inappropriate, hereby proposed amendments. Figure 19.1-9 B shows the circuit and the actual (Figure 1) .Generally, the operating voltage range of light-emitting diode is 1.8V to 2.5V, [1] and can not be directly connected to 220V in the home circuit.So, in the