A.1520 B.1550 C.1820 D.1250
A.無(wú)公害產(chǎn)品認(rèn)證 B.環(huán)保產(chǎn)品認(rèn)證 C.綠色食品認(rèn)證 D.有機(jī)食品認(rèn)證
A.收斂型蛛網(wǎng) B.發(fā)散型蛛網(wǎng) C.封閉型蛛網(wǎng)