| 摘要 |
PCT No. PCT/DE94/00240 Sec. 371 Date Sep. 11, 1995 Sec. 102(e) Date Sep. 11, 1995 PCT Filed Mar. 4, 1994 PCT Pub. No. WO94/20851 PCT Pub. Date Sep. 15, 1994A gas distributor with critical nozzles is proposed, the nozzle cross-sections increasing by 1:2 from one to the next, and each of these nozzles being capable of admitting either a test gas or a zero gas. With four nozzles of this type, 16 linearly graduated concentrations of the test gas in the zero gas are obtained.
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