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众人的惊讶已经成为习惯，全都竖起耳朵听尹旭自己讲解。The following question: The fire truck lane should meet the requirements of disaster relief and evacuation, and its width should ensure that the fire truck can still pass after the houses on both sides of the main road are affected and collapsed. Reasonable planning, construction and renovation of fire lanes shall be carried out in the blocks. The width, spacing and turning radius of fire truck passages shall be required by relevant regulations of symbols to ensure the smooth flow of fire truck. Cities with rivers and railways passing through should take measures such as adding bridges to ensure the smooth flow of fire engines. Due to the needs of urban construction, when temporary excavation or occupation is necessary, the approving unit must promptly notify the public security fire supervision institution. GB50016-2006 Code for Fire Protection Design of Buildings 6.0. 1 The passage of fire engines should be considered for the roads in the block, and the distance between the center lines of the roads should not be greater than 160.0 m m. When the length of the building along the street is greater than 150.0 m or the total length is greater than 220.0 m, a fire lane shall be set up to pass through the building. When it is really difficult, an annular fire lane shall be set up. 6.0. 2 For buildings with closed inner courtyard or patio, when the short side length is greater than 24.0 m, fire lanes entering the inner courtyard or patio should be set up. 6.0. 3 When buildings with closed inner courtyard or patio are along the street, pedestrian passageways (stairwells can be used) connecting the street and inner courtyard shall be set up, and the spacing shall not be greater than 80.0 m m.. 6.0. 4 Facilities that affect the passage of fire engines or the safe evacuation of personnel shall not be set up on both sides of the fire lanes that pass through the building or enter the inner courtyard of the building. 6.0. 5 Gymnasium with more than 3000 seats, exceeding逼人毕其一生，只为背熟那四书五经，悲剧啊。White version结果到头来，换来的却是侄子这样的回报和不理解。Define two implementation classes respectively: