Combustible gas indicators measure the presence of combustible gas as a percentage of the（）.<br>A:flash point<br>B:upper explosive limit<br>C:lower explosive limit<br>D:fire point

Combustible gas indicators measure the presence of combustible gas as a percentage of the（）.
A:flash point
B:upper explosive limit
C:lower explosive limit
D:fire point

出自：海船船员证

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