一简谐振动的旋转矢量图如右图，设图中圆的半径为R，则该简谐振动的振动方程为
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 用波长为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/f83cfabe43504aaabfed8ef51f445118.png" />的光垂直入射在一光栅上, 发现在衍射角为j 处出现缺级, 则此光栅上缝宽的最小值为 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/9f827703044645dcb814a3797bff0686.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/689f4282749d4f79b8c3de619b87d94e.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/7ee1e7c994894f1fb25264c84fbaad9c.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/c72a2486b1304666ad4e18e4614a5f07.png" />
- 《三国演义》第四十九回“七星坛诸葛祭风，三江口周瑜纵火”中，诸葛亮向周瑜提出可借三日三夜东南大风，以助公瑾破曹。诸葛亮借的是哪个风（） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/7ae07c7288d045048665b872eb883f5b.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/c2878ab18ac64afd9c5b528efe2c7ed2.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/e9c5e6054460452c92dadf2ef4093bd4.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/9eb59a44e3c44a408835cb05bf3890a6.png"/>
- 设<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/bed4f91f4fec44358e1cad3163fc6b90.png" />是在区间<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/a58a11f71a434f2ab38a2f347802f010.png" />上的<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/a392447e03794318affaa2b03bb5967b.png" />的分段线性插值函数，以下条件不是<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/c00fe77a8291453a8cb2577eb68735ad.png" />必须满足的条件是________________. A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/cf6e811a4488413fae8f1839e4d098ea.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/bb93b2d7d02245878ec51e2986c97b5d.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/ec6692c00c2e49b6adbf9b0493638b81.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/214f277da4154f58a43751f80b09d959.png" />
- 若x2+y2=1，则dy为（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/d045b5f235a54083ab91e6f717cf00d8.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/74173c5355234874ab8cb9275865d5d6.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/bbfb37ba58fc4de0aa8688e0bb53cef5.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/f9a206c25e8c4ea1bd7b51519afd76b7.png" />
- <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/2205d9f03e724a04b34f2f1045309079.png" />的幅频响应是，幅频响应是。 A: 1，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/760d7fcc2f264ed1b10fb836cb48f565.png" /> B: -1，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/21f685d2962e4b6993bfcaa513bdbf68.png" /> C: 2，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/57267e995f86426899ce3cc0177a2343.png" /> D: 1，<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/ea8ba62853a94a15a5620c5165e3594a.png" />