单选题：下列关于煤气设施的作业与检修，说法正确的是( )。

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题目内容：

下列关于煤气设施的作业与检修，说法正确的是( )。 A．抽堵盲板和送煤气作业一般不要在夜间进行，但可以在雷雨天进行
B．送煤气时点不着火，或着火后又熄灭，应立即第二次点火，直到点燃为止
C．如果火焰过长而火苗呈黄色则是煤气不完全燃烧现象，应及时增加空气量或适当减少煤气量
D．短时间检修可用闸阀隔断煤气来源

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