A、CO<sub>2sub> B、N<sub>2sub> C、氦 D、氖
A、CO<sub>2sub>浓度65%~85%,时间15~45S B、CO<sub>2sub>浓度100%,时间15~45S C、CO<sub>2sub>浓度21%,时间2~3S D、O<sub>2sub>浓度21%,时间2~3S
A、CH<sub>4sub>+2S<sub>2sub>→CS<sub>2sub>+H<sub>2sub>S B、CH<sub>4sub>+2S<sub>2sub>→CS<sub>2sub>+2H<sub>2sub>S C、CH<sub>4sub>+S<sub>2sub>→CS<sub>2sub>+2H<sub>2sub> D、CH<sub>4sub>+3S<sub>2sub>→CS<sub>2sub>+4H<sub>2sub>S
A、BeCl<sub>2sub>和HgCl<sub>2sub> B、CO<sub>2sub>和CS<sub>2sub> C、H<sub>2sub>S和H<sub>2sub>O D、BF<sub>3sub>和CCl<sub>3sub>
A、CH≡CCH=CH<sub>2sub> B、CH<sub>2sub>=CHCH<sub>2sub>CH<sub>3sub> C、CH<sub>3sub>CH<sub>2sub>CH<sub>2sub>CH<sub>3sub> D、CH≡CCH<sub>2sub>CH<sub>3sub>