单项选择题
A.4 B.3 C.2 D.1
A.清水 B.清洁剂 C.安替克 D.酒精
A.50℃ B.60℃ C.70℃ D.80℃
A.50min B.40min C.30min D.20min
A.90KPa B.80KPa C.70KPa D.60KPa
A.70%-90% B.40%-70% C.20%-40% D.10%-20%
A.0.2~0.3MPa B.0.4~0.5MPa C.0.5~0.8MPa D.0.75~0.90MPa
A.0.1~0.2MPa B.0.2~0.3MPa C.0.4~0.5MPa D.0.5~0.8MPa
