题目内容：
下列有关乙炔的说法不正确的是（ ）
A燃烧时有浓厚的黑烟
B实验室制乙炔时可用CuSO4除杂质气体
C为了减缓电石和水的反应速率，可用饱和食盐水来代替
D乙炔的收集方法可用排空气法收集
答案解析：
单选题：下列有关乙炔的说法不正确的是（ ）A燃烧时有浓厚的黑烟B实验室制乙炔时可用CuSO4除杂质气体C为了减缓电石和水的反应速率，可用饱和食盐水来代替D乙炔的收集方法
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