设H<sub>A</sub>=15.032m,H<sub>B</sub>=14.729m,h<sub>AB</sub>=()m。
A、29.761
B、-0.303
C、0.303
D、-29.761
A、29.761
B、-0.303
C、0.303
D、-29.761
A、C<sub>6sub>H<sub>6sub>N<sub>4sub> B、C<sub>6sub>H<sub>5sub>NO<sub>2sub> C、C<sub>9sub>H<sub>10sub>O<sub>2sub> D、C<sub>8sub>H<sub>15sub>O<sub>2sub>
A、无水铜配体化合物[(C<sub>10sub>H<sub>15sub>NO)<sub>2sub>CuO] B、含2分子结晶水的铜配位化合物[(C<sub>10sub>H<sub>15sub>NO)<sub>2sub>CuO·2H<sub>2sub>O] C、合4分子结晶水的铜配位化合物[(C<sub>10sub>H<sub>15sub>NO)<sub>2sub>CuO·4H<sub>2sub>O] D、铜的氧化物 E、含5分子结晶水的硫酸铜
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>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、作业高度2m<h<sub>wsub>≤5m,高处作业分级为Ⅰ级 B、作业高度2m<h<sub>wsub>≤5m,高处作业分级为Ⅱ级 C、作业高度5m<h<sub>wsub>≤15m,高处作业分级为Ⅱ级 D、作业高度5m<h<sub>wsub>≤15m,高处作业分级为Ⅲ级 E、作业高度15m<h<sub>wsub>≤30m,高处作业分级为Ⅲ级
A、H<sub>Bsub>>H<sub>Csub>>H<sub>Asub> B、H<sub>Asub>>H<sub>Bsub>>H<sub>Csub> C、H<sub>Csub>>H<sub>Asub>>H<sub>Bsub> D、H<sub>Asub>>H<sub>Csub>>H<sub>Bsub>
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>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>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>