A、V<sub>1sub>与V<sub>4sub>导通,V<sub>2sub>与V<sub>3sub>关断 B、V<sub>1sub>常通,V<sub>2sub>常断,V<sub>3sub>与V<sub>4sub>交替通断 C、V<sub>1sub>与V<sub>4sub>关断,V<sub>2sub>与V<sub>3sub>导通 D、V<sub>1sub>常断,V<sub>2sub>常通,V<sub>3sub>与V<sub>4sub>交替通断
A、V<sub>1sub>与V<sub>4sub>导通,V<sub>2sub>与V<sub>3sub>关断 B、V<sub>1sub>常通,V<sub>2sub>常断,V<sub>3sub>与V<sub>4sub>交替通断 C、V<sub>1sub>与V<sub>4sub>关断,V<sub>2sub>与V<sub>3sub>导通 D、V<sub>1sub>常断,V<sub>2sub>常通,V<sub>3sub>与V<sub>4sub>交替通断
A、V<sub>1sub>=V<sub>2sub>-V<sub>3sub>+V<sub>4sub> B、V<sub>2sub>=V<sub>1sub>-V<sub>3sub>+V<sub>4sub> C、V<sub>1sub>=V<sub>3sub>-V<sub>2sub>+V<sub>4sub> D、V<sub>1sub>=V<sub>3sub>-V<sub>4sub>+V<sub>2sub>
A、图所示有一定位压力水箱,其中封闭水箱液面上的表压强p=0.118MPa,水由其中流出,并沿着由三个不同直径的管路所组成的管路流到开口容器中。H<sub>1sub>=1m,H<sub>2sub>=3m,管路截面积A<sub>1sub>=1.5A<sub>3sub>,A<sub>2sub>=2A<sub>3sub>,A<sub>3sub>=0.002m2。试确定水的流量Q。
A、V<sub>1sub>、V<sub>2sub>、V<sub>3sub> B、V<sub>3sub>、V<sub>4sub>、V<sub>5sub> C、V<sub>6sub>、I、aVL D、V<sub>1sub>~V<sub>4sub> E、V<sub>1sub>~V<sub>6sub>、I、aVL
A、W=q<sub>fsub>·F<sub>Fsub> B、W<sub>vsub>=Q<sub>vsub>+Q<sub>Fsub> C、V<sub>Bsub>=V·W D、W=q<sub>fsub>+(Q/V)