A.8時(shí)-16時(shí)B.9時(shí)-16時(shí)C.9時(shí)-15時(shí)D.8時(shí)-15時(shí)
A.2hm2~3hm2B.2hm2~4hm2C.3hm2~5hm2D.3hm2~4hm2
A.0.2%B.0.8%C.0.5%D.0.3%