Which statement is TRUE concerning combustible gas indicators ________.A.One sample of air
Which statement is TRUE concerning combustible gas indicators ________.
A.One sample of air is adequate to test a tank
B.They do not work properly where there is a lack of oxygen
C.They will detect a lack of oxygen
D.They are calibrated to read the percentage chance of explosion
![](https://lstatic.shangxueba.com/sxbcn/h5/images/tips_org.png)