A、1∶2
B、1∶4
C、2∶1
D、4∶1
更多“ 在电路中R<sub>1</sub>和R<sub>2</sub>并联，R<sub>1</sub>=2Ω，R<sub>2</sub>=4Ω，则它们的电流比I<sub>1</sub>：I<sub>2</sub>=（）。”相关的问题
A、R<sub>1sub>烧坏，R<sub>2sub>不会烧坏 B、R<sub>1sub>、R<sub>2sub>均烧坏 C、R<sub>1sub>未烧坏，R<sub>2sub>烧坏 D、R<sub>1sub>、R<sub>2sub>均未烧坏
A、R<sub>1sub>烧坏，R<sub>2sub>不会烧坏 B、R<sub>1sub>，R<sub>2sub>均烧坏 C、R<sub>1sub>未烧坏，R<sub>2sub>烧坏 D、R<sub>1sub>，R<sub>2sub>均未烧坏
A、已知电路如图所示，其中E<sub>1sub>=15V，E<sub>2sub>=65V，R<sub>1sub>=5Ω，R<sub>2sub>=R<sub>3sub>=10Ω。试用支路电流法求R<sub>1sub>、R<sub>2sub>和R<sub>3sub>三个电阻上的电压。rc="https://img.ppkao.com/2018-09/tangxueping/2018092817031193342.jpg" />
A、共发射极电路的A<sub>Vsub>最大、R<sub>Isub>最小、R<sub>Osub>最小 B、共集电极电路的A<sub>Vsub>最小、R<sub>Isub>最大、R<sub>Osub>最小 C、共基极电路的A<sub>Vsub>最小、R<sub>Isub>最小、R<sub>Osub>最大 D、共发射极电路的A<sub>Vsub>最小、R<sub>Isub>最大、R<sub>Osub>最大
A、R<sub>1sub>与R<sub>3sub>串联后与R<sub>2sub>并联 B、R<sub>1sub>与R<sub>3sub>并联后与R<sub>2sub>串联 C、R<sub>1sub>与R<sub>2sub>并联后与R<sub>3sub>串联 D、R<sub>1sub>与R<sub>2sub>串联后与R<sub>3sub>并联
A、（R<sub>1sub>+R<sub>2sub>）/R<sub>1sub>R<sub>2sub> B、R<sub>1sub>R<sub>2sub>/（R<sub>1sub>+R<sub>2sub>） C、R<sub>1sub>+R<sub>2sub> D、R<sub>1sub>R<sub>2sub>
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>。rc="https://img.ppkao.com/2018-05/tangxueping/2018051015543465216.jpg" />
A、在图示的齿轮-连杆组合机构中，齿轮a与曲柄1固联，齿轮b和c分别活套在轴C和D上，试证明齿轮c的角速度ω<sub>csub>与曲柄1、连杆2、摇杆3的角速度ω<sub>1sub>、ω<sub>2sub>、ω<sub>3sub>之间的关系为ω<sub>csub>=ω<sub>3sub>（r<sub>bsub>+r<sub>csub>）/r<sub>csub>-ω<sub>2sub>（r<sub>asub>+r<sub>bsub>）/r<sub>csub>+ω<sub>1sub>r<sub>asub>/r<sub>csub>。rc="https://img.ppkao.com/2019-04/wangxuan/2019041015131573778.jpg" />
A、R<sub>1sub>＞R<sub>2sub>＞R<sub>3sub> B、R<sub>1sub>＜R<sub>2sub>＜R<sub>3sub> C、R<sub>1sub>＞R<sub>3sub>＞R<sub>2sub> D、R<sub>3sub>＞R<sub>1sub>＞R<sub>2sub>
A、R<sub>1sub>—CH=CH—R<sub>2sub>反式 B、R<sub>1sub>—CH=CH—R<sub>2sub>顺式 C、R<sub>1sub>—CH=CH<sub>2sub>
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