A、液态O<sub>2sub> B、液态CO<sub>2sub> C、液态N<sub>2sub> D、P<sub>5sub>(OH)<sub>2sub>
A、求图示电路中R<sub>3sub>为何值时,R<sub>5sub>支路中的电流I<sub>5sub>=0。
c="https://img.ppkao.com/2018-08/lina/2018082008481339514.jpg" />
A、(CH<sub>3sub>)<sub>3sub>C-CH<sub>2sub>-Br B、CH<sub>3sub>Cl C、(CH<sub>3sub>)<sub>3sub>C-Br D、(CH<sub>3sub>)<sub>3sub>CH<sub>2sub>-CHBrCH<sub>3sub>
A、CH<sub>4sub> B、C<sub>2sub>H<sub>4sub> C、C<sub>2sub>H<sub>6sub> D、C<sub>2sub>H<sub>2sub>
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、C<sub>2sub>H<sub>5sub>OH B、C<sub>5sub>H<sub>6sub>OCH<sub>3sub> C、C<sub>2sub>H<sub>5sub>OCH<sub>3sub> D、C<sub>5sub>H<sub>6sub>OH