以下方程中能够说明磁场是非保守力场的是
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 下列汉字，不是会意字的有（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/3745c24ad6b741e1b0515f6f78732902.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/f2a234fa226e4c2283d973264d41a1cf.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/e727986add1f4513b034e96ba2a88137.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/5a95cc0dd6e64226a205a4ef6185f991.png" />
- 下列汉字中是象形字的有（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/8cecee6c952546deb3a1cefc3a98d641.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/7f6c55d56ebc4497913c8b2d9c761bf3.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/8f5a8473ecfe40a09b7f49bfea126107.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/cf93cf19ebae41d999f0229253098fe7.png" />
- 下列汉字，是指事字的有（ ）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/a78009bbfc6443ad832d8ed215f9ec60.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/4ef5ae27ef2342e69844ef4cdd833c71.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/117a39b9b1bd4666b7c705a3868877b8.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/5635b12d2e9d479697bab0ec3e94eb4d.png" />
- 恒温恒压下，可逆反应达到平衡时，下列关系式正确的是： A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/14235e8fd11a44c89c953ff541fa1504.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/70016c166b8a47f19cfeba63da858e6f.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/f846aca457ea41bca91053f4d9d84449.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/e4b47257d5814e6fb45de9d47ee9965a.png" />
- 1、如图所示，质量均匀分布的薄圆盘，质量为m，半径为R，轴O与圆盘所在面垂直，且通过圆心，则圆盘对该轴O的的转动惯量是<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/7e7becd1e61f4a63b9131512754c10f4.png" /> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/b7879f7377c64d3e85868ea0dbfec71e.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/263ab867d6ec4c209bcc109ff27c4cd5.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/44592dde9ecf4d059307bcf4eb75d66f.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202004/4ceb4527c74046378f2ba87e4d779d06.png" />