问题
单项选择题
喷灯的基本构造：燃油灌、气筒、把手、油杯、（）及旋钮、防火罩、喷咀。
A.油针
B.油封
C.汽油
D.油漏
答案
参考答案：A
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喷灯的基本构造：燃油灌、气筒、把手、油杯、（）及旋钮、防火罩、喷咀。
A.油针
B.油封
C.汽油
D.油漏
参考答案：A
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