1 . 随着电力的发展与石油的消耗,风力发电越来越受到重视.预计到2025年全球风电新增装机量达到111.2GW,中国的装机量占比达到世界第一.已知风速稳定时风力发电机叶片围绕转轴中心做匀速圆周运动,现有两个风力发电机,
和
分别为两个风力发电机叶片边缘一点,
和
到各自转轴中心距离均为20米,初始时刻
处于所在的发电机转轴中心正上方,
处于所在的发电机转轴中心正下方,且
和
围绕各自发电机转轴中心做匀速圆周运动.由于两个发电机所处位置风速不同,
点转速为
,
点转速为
,以时间
(单位:秒)为自变量,
和
与各自发电机转轴中心高度差为应变量,分别得三角函数
与
,下列哪种方式可以使
变为
( )
![](https://img.xkw.com/dksih/QBM/2023/1/22/3158398055669760/3164262622699520/STEM/040e218ddd5b440180051e29dde69739.png?resizew=183)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e799df23c6230f535978d3240c85e23.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2709ca478fb15ea08e8aa55328eae8e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82a1224e47f31ecdfffd328d5a3ab6d.png)
![](https://img.xkw.com/dksih/QBM/2023/1/22/3158398055669760/3164262622699520/STEM/040e218ddd5b440180051e29dde69739.png?resizew=183)
A.将![]() ![]() ![]() |
B.将![]() ![]() ![]() |
C.将![]() ![]() ![]() |
D.将![]() ![]() ![]() |
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