ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾ£¬Ð¡Ó͹͸¾µ£¨f=10cm£©¹Ì¶¨ÔÚ¹â¾ß×ù40cmµÄλÖã¬Ì½¾¿Í¹Í¸¾µ³ÉÏñ¹æÂÉ¡£ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A.½«À¯Öò´Ó½¹µãÄÚij´¦Ïò͸¾µ·½ÏòÒƶ¯¹ý³ÌÖУ¬ÏñÖð½¥±äС
B.µ±¹âÆÁÉϳÉÇåÎúµÄÏñʱ£¬Äÿª¹âÆÁ£¬ÑÛ¾¦ÔÚÒ»¶¨·¶Î§ÄÚÈÔÄÜ¿´µ½Ïñ
C.½«À¯Öò·ÅÔÚ10cm´¦£¬Òƶ¯¹âÆÁ£¬¹âÆÁÉϿɵõ½µ¹Á¢ËõСµÄÇåÎúÏñ
D.À¯ÖòȼÉÕÒ»¶Îʱ¼äºó±ä¶Ì£¬Ïñ³ÉÔÚ¹âÆÁµÄÏ·½£¬¿É½«Í¸¾µµÄ¸ß¶ÈÏòϵ÷£¬Ê¹Ïñ³ÉÔÚ¹âÆÁÖÐÐÄ
¡¾´ð°¸¡¿ABC
¡¾½âÎö¡¿
A£®¸ù¾Ý¡°ÎÞÂÛʵÏñ»òÐéÏñ£¬ÎïÌå¿¿½ü½¹µãÏñ¶¼±ä´ó¡±¿ÉÖª£¬À¯Öò´Ó½¹µãÄÚij´¦Ïò͸¾µ·½ÏòÒƶ¯¹ý³ÌÖУ¬Ëù³ÉµÄÐéÏñ½«±äС£¬¹ÊAÕýÈ·£»
B£®ÄÜÔÚ¹âÆÁÉϳÉÇåÎúÏñµÄÊÇʵÏñ£¬ÊµÏñÊÇʵ¼Ê¹âÏß»á¾Û³ÉµÄ£¬µ±°Ñ¹âÆÁÈ¥µôºó£¬Êµ¼Ê¹âÏß»á¾Û³ÉʵÏñºó¼ÌÐø´«²¥£¬½øÈëÈ˵ÄÑÛ¾¦£¬¹ÊBÕýÈ·£»
C£®½«À¯Öò·ÅÔÚ10cm´¦Ê±£¬Îï¾àΪ30cm£¬¶ø½¹¾àΪ10cm£¬¼´Îï¾à´óÓÚÁ½±¶½¹¾à£¬¹âÆÁÉÏÄܳнӵ½µÄÊǵ¹Á¢ËõСµÄÏñ£¬¹ÊCÕýÈ·£»
D£®À¯ÖòȼÉÕÒ»¶Îʱ¼äºó±ä¶Ì£¬¸ù¾Ý¹âµÄÖ±Ïß´«²¥ÔÀí£¬Ôò³ÉµÄÏñ»áÆ«Ïò¹âÆÁÉÏ·½£¬¿ÉÏòÏÂÊʵ±µ÷Õû͹͸¾µ£¬¹ÊD²»ÕýÈ·¡£
¹ÊÑ¡ABC¡£