孩子上学,父母当然要给他准备好学习用品和在学校用的一般生活用具。然而,您知道这些东西的卫生要求吗? 笔记本纸张应致密,不易被墨汁浸透,从纸背面不应看到正面所写的字。铅笔应选用软硬适中(HB)型的铅笔。硬芯(H)型写出的字迹淡而细,使学生眼睛常处在高度紧张状态。软芯(B)型写出的字迹浓而粗,显得脏乱。另外,笔杆最好是有棱面的,七岁孩子的手指钙化没有完成,圆杆的笔,捏不住。笔杆上 Children go to school, of course, parents should give him a ready-made school supplies and general-purpose tools for use in school. However, do you know the hygienic requirements of these things? Notebook paper should be dense, not easily soaked with ink, should not be seen from the front of the paper to read the word. Pencil should be used hard and soft mode (HB) pencil. Hard core (H) -shaped type written light and thin, so that students often in high tension eyes. Soft core (B) type writing thick and thick, it seems dirty. In addition, the pen is best to have a faceted, seven-year-old children’s fingers calcification is not completed, round pen, pinch. On the pen