H<sub>2</sub>与空气混合,H<sub>2</sub>的着火含量范围是4.0%~74.2%,下列情况不可能着火的是()。
A、H2的含量50.0%
B、H2的含量20.0%
C、H2的含量10.0%
D、H2的含量2.0%
A、H2的含量50.0%
B、H2的含量20.0%
C、H2的含量10.0%
D、H2的含量2.0%
A、∆H<sub>3sub>=∆H<sub>1sub>+∆H<sub>2sub> B、∆H<sub>3sub>=∆H<sub>1sub>-∆H<sub>2sub> C、∆H<sub>3sub>=∆H<sub>2sub>-∆H<sub>1sub> D、∆H<sub>3sub>=2∆H<sub>1sub>-∆H<sub>2sub>
A、H<sub>1sub>、H<sub>2sub>A、H<sub>2sub>B、H<sub>3sub> B、H<sub>1sub>、H<sub>2sub>A、H<sub>2sub>B、H<sub>3sub>A C、H<sub>2sub>A、H<sub>2sub>B、H<sub>3sub>、H<sub>4sub> D、H<sub>2sub>A、H<sub>2sub>B、H<sub>3sub>A、H<sub>4sub>
A、H<sub>2sub>的辐射能力比N<sub>2sub>大得多 B、H<sub>2sub>比热系数N<sub>2sub>大得多 C、H<sub>2sub>比重比N<sub>2sub>小得多 D、H<sub>2sub>导热系数比N<sub>2sub>大得多
A、△H<sub>1sub>+ △H<sub>2sub>+△H<sub>3sub> =△H<sub>4sub> B、△H<sub>1sub>+ △H<sub>2sub> = △H<sub>3sub> +△H<sub>4sub> C、(△H<sub>1sub>+ △H<sub>2sub>)-(△H<sub>3sub> +△H<sub>4sub>)=△H<sub>5sub> D、△H<sub>1sub>+△H<sub>2sub>+△H<sub>3sub>+△H<sub>4sub> =△H<sub>5sub>
A、(a)H<sub>2sub>O(l,373K,100kPa)与(b)H<sub>2sub>O(g,373K,100kPa) B、(a)H<sub>2sub>O(l,373K,200kPa)与(b)H<sub>2sub>O(g,373K,200kPa) C、(a)H<sub>2sub>O(l,374K,100kPa)与(b)H<sub>2sub>O(g,374K,100kPa) D、(a)H<sub>2sub>O(l,373K,100kPa)与(b)H<sub>2sub>O(g,373K,200kPa)
A、CH<sub>4sub>、CO、C<sub>2sub>H<sub>4sub>、C<sub>2sub>H<sub>6sub> B、CH<sub>4sub>、CO、C<sub>2sub>H<sub>4sub>、C<sub>2sub>H<sub>6sub>、C<sub>2sub>H<sub>2sub> C、CH<sub>4sub>、C<sub>2sub>H<sub>2sub>、C<sub>2sub>H<sub>4sub>、C<sub>2sub>H<sub>6sub> D、CO、CO<sub>2sub>、H<sub>2sub>、CH<sub>4sub>、C<sub>2sub>H<sub>4sub>、C<sub>2sub>H<sub>6sub>
A、H<sub>2sub>→C<sub>2sub>H<sub>4sub>→C<sub>3sub>H<sub>6sub>→C<sub>2sub>H<sub>2sub>→CO B、H<sub>2sub>→CO→C<sub>2sub>H<sub>4sub>→C<sub>3sub>H<sub>6sub>→C<sub>2sub>H<sub>2sub> C、H<sub>2sub>→C<sub>2sub>H<sub>4sub>→C<sub>3sub>H<sub>6sub>→CO→C<sub>2sub>H<sub>2sub> D、CO→H<sub>2sub>→C<sub>2sub>H<sub>4sub>→C<sub>3sub>H<sub>6sub>→C<sub>2sub>H<sub>2sub>
A、△H<sub>1sub>〈△H<sub>2sub>,W<sub>1sub>〉W<sub>2sub> B、△H<sub>1sub>〉△H<sub>2sub>,W<sub>1sub>〈W<sub>2sub> C、△H<sub>1sub>〈△H<sub>2sub>,W<sub>1sub>〈W<sub>2sub> D、△H<sub>1sub>〉△H<sub>2sub>,W<sub>1sub>〉W<sub>2sub>
A、CO<sub>2sub>和H<sub>2sub> B、CO<sub>2sub>和H<sub>2sub>O C、CO和H<sub>2sub> D、CO和H<sub>2sub>O