单项选择题
A.0.6~0.7B.0.7~0.8C.0.8~0.9D.0.9~0
A.0.3~0.5B.0.5~0.8C.0.8~0D.0~2
A.5~6B.6~7C.7~8D.8~9
A.涡扇B.涡流C.吹扫D.喷射
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