单选题：金属铸造是将熔融的金属注入、压入或吸入铸模的空腔中使之成型的加工方法。铸造作业中存在着多种危险有害因素。下列危险有害因素

题目内容：
金属铸造是将熔融的金属注入、压入或吸入铸模的空腔中使之成型的加工方法。铸造作业中存在着多种危险有害因素。下列危险有害因素中，不属于铸造作业危险有害因素的是（）。 A．机械伤害
A．机械伤害
B．高处坠落
B．高处坠落
C．噪声振动
C．噪声振动
D．乙炔爆炸
D．乙炔爆炸
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