一年级数独技巧视频教程

简介：Pinghai County is just a small county with backward economy, and the quality of teaching is somewhat poor. Except for No. 1 Middle School, an old county-level middle school, which has a standard quota of 17 classes for the second grade, No. 7 Middle School only has a quota of 12 classes. No. 4 Middle School has six classes, and No. 3 Middle School is even worse. The entire school is about to be shut down.