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A.3 B.6 C.9 D.12
A.麻蠅幼蟲第八腹節(jié)后表面有深凹陷 B.前氣門的指狀突數(shù) C.氣門環(huán)完整，氣門紐發(fā)達 D.第八腹節(jié)表面有深凹陷
A.6 B.8 C.10 D.12
