The final exam is approaching, and there are only 11 days left before the graduate exam. How to choose 2B pencil? 1 look: the pen should be straight, the brand is clear, the lead is in the middle 2 touch: the pen should be smooth 3 smell: there should be no paint pungent smell 4 write: whether it is easy to break, the concentration is not enough 5 cutting: pencil shavings should be continuous, Not easy to break. Don't be "harmed" by inferior pencils, spread! (CCTV reporter Zhang Pengjun)
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