A、HCl B、H<sub>3sub>BO<sub>3sub> C、C<sub>2sub>H<sub>4sub> D、CH<sub>3sub>
A、 CH<sub>3sub>COOH B、 H<sub>3sub>BO<sub>3sub> C、 Na<sub>2sub>SO<sub>4sub> D、 Na<sub>2sub>SO<sub>3sub>
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、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、HCOOH(Ka=1.77×10-4) B、H<sub>3sub>BO<sub>3sub>(Ka=7.3×10-10) C、HAc(Ka=1.76×10-5) D、H<sub>2sub>C<sub>4sub>H<sub>4sub>O<sub>4sub>(Ka1=6.4×10-5,Ka2=2.7×10-6) E、C<sub>6sub>H<sub>5sub>COOH(Ka=6.46×10-5)
A、接触浓硫酸是穿丝绸工作服 B、接触烧碱是穿毛料工作服 C、被碱类烧伤后用2%H<sub>3sub>BO<sub>3sub>洗 D、被酸烧伤后用2%NaHCO<sub>3sub>洗涤
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、CH<sub>3sub>NH<sub>2sub>〉NH<sub>3sub>〉C<sub>6sub>H<sub>5sub>NHCH<sub>3sub> B、CH<sub>3sub>NH<sub>2sub>〉C<sub>6sub>H<sub>5sub>NHCH<sub>3sub>〉NH<sub>3sub> C、C<sub>6sub>H<sub>5sub>NHCH<sub>3sub>〉NH<sub>3sub>〉CH<sub>3sub>NH<sub>2sub> D、NH<sub>3sub>〉CH<sub>3sub>NH<sub>2sub>〉C<sub>6sub>H<sub>5sub>NHCH<sub>3sub>
A、CaCO<sub>3sub>+H<sub>3sub>PO<sub>4sub> B、Ca<sub>5sub>F(PO<sub>4sub>)<sub>3sub>+H<sub>2sub>SO<sub>4sub> C、CaF<sub>2sub>+H<sub>3sub>PO<sub>4sub> D、CaSO<sub>4sub>+H<sub>3sub>PO<sub>4sub>