图中直线是（）线。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/07624b15d0794d71be4237bebdff73ec.png
举一反三
- 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<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/dfd995a36f4e4dd2adb52a50cc5a26de.png"/> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/e69d65d5dd4e49f9863425ce3fb5ac54.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/b13da9634fc9435398489686c8d362f9.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/e7906edc65b14dc39bafcb683986a690.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/0bfe1b068eac44d59d8772eb9bcbf871.png"/>
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/d95f303f761f4007a63f2df4a3f1596f.png
- 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" />
- 在接待室，图中哪一个位置是上座，请选择（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201807/10497b05dd834d1bbc593b6bffedf42b.png
- 下面的投影图中表示交错直线的是（） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/abd70ceaf2b1417f8db7dcbdafe06a4e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/69c37bc573b34b00829846f0d05b1b8e.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/467d9b64267e4a99928004e28e8ce78f.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/ab49baad1d7f4b4bbfd286c3225870bb.png" />