visits can be put up in the guesthouse,provided with modern facilities,

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• visits can be put up in the guesthouse,provided with modern facilities,
• .since many of them worked during the day,bill had to get the money at money at night
• 一质点的运动方程是S=a(t-5)^2+b(S单位:m,t单位：s),且t=7时的速度为3,则在t=3时质点的速度为