【題目】（題文）下列關(guān)于經(jīng)緯線的敘述，正確的是(　　)
      A. 所有的經(jīng)線都平行 B. 本初子午線是東經(jīng)、西經(jīng)的分界線
      C. 經(jīng)線、緯線長度相等 D. 經(jīng)線指示東西方向
      			
      


			
      

		
      
		
		
	
      
		
      
			
      
				
      
				
      【答案】B
      【解析】
      經(jīng)線是連接南北兩極并同緯線垂直相交的半圓，也稱子午線。經(jīng)線指示南北方向；所有經(jīng)線都呈半圓狀且長度相等。緯線是在地球儀上，順著東西方向，環(huán)繞地球儀一周的圓圈。所有的緯線都相互平行，并與經(jīng)線垂直，緯線指示東西方向。緯線圈的大小不等，赤道為最大的緯線圈，從赤道向兩極緯線圈逐漸縮小，到南、北兩極縮小為點(diǎn)。
      所有的經(jīng)線都相交在南北極點(diǎn)上，故A錯誤；本初子午線是0°經(jīng)線，是東經(jīng)、西經(jīng)的分界線，故B正確；緯線長度不相等，從赤道向南北兩極逐漸變短，故C錯誤；經(jīng)線指示南北方向，不是東西方向，故D錯誤；故選B。
      				
      
							
      
			
      
			
      
			
			
      
		
      
	
      

		
      

		





			
      
		
      
		
				
      
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