[单选题]实验室常用的气体钢瓶颜色分别是: ( )

A、N2瓶蓝色, H2瓶黑色, O2瓶绿色
B、N2瓶黑色, H2瓶绿色, O2瓶蓝色
C、N2瓶绿色, H2瓶黑色, O2瓶蓝色
D、N2瓶黑色, H2瓶蓝色, O2瓶绿色

参考答案： B

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