A、Fe<sub>3sub>O<sub>4sub> B、PdCl<sub>2sub>-CuCl<sub>2sub> C、Ag<sub>2sub>O D、五氧化二钒
A、如图所示为电桥电路,已知R<sub>1sub>=1Ω、R<sub>2sub>=2Ω、R<sub>3sub>=2Ω、R<sub>4sub>=4Ω、R<sub>5sub>=5Ω,试求等效电阻R<sub>absub>。
A、I<sub>1sub>-I<sub>2sub>-I<sub>3sub>-I<sub>4sub> + I<sub>5sub>=0 B、I<sub>1sub>-I<sub>2sub> + I<sub>3sub>-I<sub>4sub>-I<sub>5sub>=0 C、I<sub>1sub>-I<sub>2sub>+ I<sub>3sub> + I<sub>4sub> +I<sub>5sub>=0 D、I<sub>1sub>-I<sub>2sub> + I<sub>3sub>-I<sub>4sub> + I<sub>5sub>=0
A、与足量的NaOH溶液共热后,再通入足量CO<sub>2sub> B、与足量的NaOH溶液共热后,再加入适量H<sub>2sub>SO<sub>4sub> C、与稀H<sub>2sub>SO<sub>4sub>共热后,加入足量的NaOH溶液 D、与稀H<sub>2sub>SO<sub>4sub>共热后,加入足量的Na<sub>2sub>CO<sub>3sub>溶液
A、[Cr(NH<sub>3sub>)<sub>4sub>(H<sub>2sub>O)<sub>2sub>]Cl<sub>3sub> B、[Cr(NH<sub>3sub>)<sub>4sub>(H<sub>2sub>O)<sub>2sub>Cl]Cl<sub>2sub> C、[Cr(NH<sub>3sub>)<sub>4sub>(H<sub>2sub>O)CL]Cl<sub>2sub>·H<sub>2sub>O D、[Cr(NH<sub>3sub>)<sub>4sub>Cl<sub>2sub>]Cl·2H<sub>2sub>O