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<img src="https://static.zxtiku.com/wangke/imgs/topic/5bdd2d80fa436793de386cabc6ff9478.jpg"/><br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/31e2b52558ea251c05110421ccb47223.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/to
直升飞机升力螺旋浆由对称的叶片组成。每一叶片的质量为136kg,长度3.66m,设叶片为均匀薄片。当叶片转动的角速度为<img src="https://static.zxtiku.com/wangke/imgs/topic/e9c62fff17c27c49b6df22e64461d940.png"/>时,则叶片根部张力为 <img src="https:
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4-12如题图 4-12所示的火星漫游车控制系统,若<img src="https://static.zxtiku.com/wangke/imgs/topic/79cf78458007c1480a7fbb5d2198ffee.jpg"/>,<img src="https://static.zxtiku.com/wangke/imgs/topic/c632c23499d7b7a1cda3c4a81af8e550.jpg"/>分别为0.1s 及1s,使系统
<img src="https://static.zxtiku.com/wangke/imgs/topic/5720a9f179eba93d6006fc3daa973ef3.jpg"/><br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/64249d4d601c7d1fd6d0261733d46c4b.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/to
设随机变量<img src="https://static.zxtiku.com/wangke/imgs/topic/a0cccfabd29f586afbe13b5b5e124ff9.jpg"/>相互独立同分布,且<img src="https://static.zxtiku.com/wangke/imgs/topic/cdc2ffb788c7297be5930724daeb4b0b.jpg"/>指数分布。记<img src="https://static.zxt
<img src="https://static.zxtiku.com/wangke/imgs/topic/686853e36e3df8dbc552398146acc3c7.jpg"/> A. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/b3df409268fcc2f29f6b6c9dc6c0b9be.jpg"/> B. <br/> <i
设<img src="https://static.zxtiku.com/wangke/imgs/topic/378c2d6e8039c2bb3f17721e25e52d12.jpg"/><img src="https://static.zxtiku.com/wangke/imgs/topic/20359947db704c1c5833132b7ae91d64.jpg"/>分别为3维线性空间的三组基,且<img src="https://static.zxtiku.com/w