A resident wants to decorate a house, so he buys several wooden strips of 0.7m and 0.8m in length. If some of these wooden strips are taken out and joined together, wooden strips of various lengths can be obtained. The following lengths of wooden strips are used These sticks cannot be joined together.
某居民要装修房屋，买来长0.7米和0.8米两种木条各若干根，如果从这些木条中取出一些接起来可以得到学多种长度的木条，下面多少长度的木条，用这些木条接起来是得不到的．
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