x (4) +x=2e t ,x(0)=x'(0)=x"(0)=x'"(0)=1. 求初值问题的解:
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举一反三
【判断题】After the small intestine completes digestion and absorption, , the large intestine begins the final treatment--that is, digestion of cellulose, absorption of water, the formation of feces and so on (...