12ÔÂ20ÈÕÏûÏ¢£¬É½¶«ÒÊÔ´ÖÐׯÍí¸»Ê¿³ö¿â¼Û¸ñÎȶ¨£¬Öܱ߿ÍÉÌ°´Ðè²¹»õ£¬ÕûÌå×ß»õËٶȻºÂý¡£75#ÒÔÉϳö¿â¼Û¸ñ2.0-2.3Ôª/½ï£¬80#ÒÔÉϹûÅ©»õ2.4-2.8Ôª/½ï¡£