单项选择题
A.3% B.5% C.7.5% D.10%
A.满载 B.轻载 C.空载 D.通烟气
A.1/3~1/2 B.1/2~2/3 C.1/3~2/3 D.2/3~1
A.15% B.10% C.5% D.3%
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