单项选择题
A.专职 B.兼职 C.专职或兼职均可
A.65°~75° B.75°~85° C.85°~90°
A.0.1~0.2m B.0.2~0.3m C.0.3~0.4m
A.1/3 B.1/4 C.1/5 D.1/6
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