The minimum concentration of a vapor in air which can form an explosive mixture is called the（）.<br>A:auto-ignition point<br>B:flash point<br>C:lower explosive limit (LEL)<br>D:threshold limit value (TLV)

The minimum concentration of a vapor in air which can form an explosive mixture is called the（）.
A:auto-ignition point
B:flash point
C:lower explosive limit (LEL)
D:threshold limit value (TLV)

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