单项选择题
A.0.40~0.45t B.0.45~0.50t C.0.55~.60t
A.加风温 B.停喷吹 C.增大喷吹 D.减风
A.1.2~2.0% B.1.1~1.9% C.1.0~1.8% D.1.0~1.5%