Method of assessment of L. 4.2.1 The test gas shall be exhaust gas of constant opacity or a light-absorptive gas of a gravimetric density similar to that of exhaust gas.
Appears in 3 contracts
Method of assessment of L. 4.2.1 The test gas shall be exhaust gas of constant opacity or a light-light- absorptive gas of a gravimetric density similar to that of exhaust gas.
Appears in 1 contract
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