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【单选题】
下列说法不正确的是( )。A.
切割前焊件表面的油污、铁锈等污物清理干净
B.
开始切割时，先预热钢板的边缘，待边缘出现红亮，将火焰局部移出边缘线以外，同时慢慢打开切割氧阀门
C.
气割时，右手握住割炬手柄，并以左手的拇指和食指控制预热氧的阀门，便于调整预热 火焰和当回火时及时切断预热氧气
D.
回火时必须立即关闭乙炔阀门，及时切断乙炔，防止乙炔倒流乙炔管内
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C.
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B.
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