51. H2S is . . . . . . . . gas.
52. The temperature of the rock is constant at a depth of . . . . . . . . m from surface.
53. The cap lamp used by the miners is
54. The R.H near sea shore is
55. The mine air should not contain less than . . . . . . . .% of O2 and . . . . . . . .% CO2.
56. Specific gravity of CO is
57. The range of PS CO detector instrument is to detect . . . . . . . . of CO%.
58. Before cap test with the cap lamp, which test is carried out
59. The R.H value in arid regions is rarely less than
60. 40% of black damp (60% air i.e. 12% O2 and 5% CO2) physiological effect on human body is . . . . . . . .
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