单项选择题
A.个人参会率低于50% B.个人参会率低于60% C.个人参会率低于70% D.个人参会率低于80%
A.1 B.2 C.3 D.4
A.3 B.6 C.10 D.12
A.20%；1200 B.15%；1500 C.10%；1000 D.15%；1200
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