更多“ 证明：事件A<sub>1</sub>，A<sub>2</sub>，...A<sub>n</sub>相互独立的充要条件是下列2n个等式成立：<br /> <img src="https://nimg.ppkao.com/2019-05/wangjue/2019050910360766378.jpg?sign=05b3551b9ed513eb9dbf23709531dcf4&t=62d7a4c5" /><br /> 其中<img src="https://nimg.ppkao.com/2019-05/wangjue/2019050910361415379.jpg?sign=27e2b64a947cf291a751b4f84cac6579&t=62d7a4c5" />取Ai或<img src="https://nimg.ppkao.com/2019-05/wangjue/2019050910362314139.jpg?sign=3752d994f9cddd51e0a3b76e17e604fa&t=62d7a4c5" />。”相关的问题
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>。
A、E<sub>1sub>〈E<sub>2sub>，A<sub>1sub>〈A<sub>2sub> B、E<sub>1sub>〈E<sub>2sub>，A<sub>1sub>〉A<sub>2sub> C、E<sub>1sub>〉E<sub>2sub>，A<sub>1sub>〈A<sub>2sub> D、E<sub>1sub>〉E<sub>2sub>，A<sub>1sub>〉A<sub>2sub>
A、e<sub>1sub>c<sub>1sub>F<sub>1sub>＝e<sub>2sub>c<sub>2sub>F<sub>2sub> B、c<sub>1sub>F<sub>1sub>＝c<sub>2sub>F<sub>2sub> C、c<sub>1sub>/c<sub>2sub>＝F<sub>2sub>/F<sub>1sub> D、c<sub>1sub>/c<sub>2sub>＝F<sub>1sub>/F<sub>2sub>
A、△H<sub>1sub>〈△H<sub>2sub>，W<sub>1sub>〉W<sub>2sub> B、△H<sub>1sub>〉△H<sub>2sub>，W<sub>1sub>〈W<sub>2sub> C、△H<sub>1sub>〈△H<sub>2sub>，W<sub>1sub>〈W<sub>2sub> D、△H<sub>1sub>〉△H<sub>2sub>，W<sub>1sub>〉W<sub>2sub>
A、△H<sub>1sub>〉△H<sub>2sub>，W<sub>1sub>〈W<sub>2sub> B、△H<sub>1sub>〈△H<sub>2sub>，W<sub>1sub>〉W<sub>2sub> C、△H<sub>1sub>=△H<sub>2sub>，W<sub>1sub>〈W<sub>2sub> D、△H<sub>1sub>=△H<sub>2sub>，W<sub>1sub>〉W<sub>2sub>
A、E<sub>1sub>
A、fy<sub>2sub>As<sub>2sub>≤fy<sub>2sub>As<sub>1sub> B、fy<sub>1sub>As<sub>2sub>≤fy<sub>1sub>As<sub>1sub> C、fy<sub>2sub>As<sub>2sub>≥fy<sub>1sub>As<sub>1sub> D、fy<sub>2sub>As<sub>1sub>≥fy<sub>2sub>As<sub>2sub>
A、{T<sub>（1）sub>≥t<sub>0sub>} B、{T<sub>（2）sub>≥t<sub>0sub>} C、{T<sub>（3）sub>≥t<sub>0sub>} D、{T<sub>（4）sub>≥t<sub>0sub>}
A、U<sub>1sub>/U<sub>2sub>=N<sub>1sub>/N<sub>2sub> B、U<sub>1sub>/U<sub>2sub>=N<sub>2sub>/N<sub>1sub> C、N<sub>1sub>/N<sub>2sub>=I<sub>2sub>/I<sub>1sub> D、N<sub>1sub>/N<sub>2sub>=I<sub>1sub>/I<sub>2sub>
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>
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