【单选题】
This is the ____ photo I have ever taken.
【单选题】
____ these honors he received a sum of money.
【单选题】
Before taking off, they were asked to ____ their seat-belts.
【单选题】
In HangzhouMr. Green was so struck by____ beauty of ____ nature that he stayed for another night. ?
【判断题】
<img src=http://huaweicloudobs.ahjxjy.cn/db7e488fc9e00874c3c04fefca18a12c.png/>
【判断题】
<img src=http://huaweicloudobs.ahjxjy.cn/d440a6ee7d5e801708929dcf6917d364.png/>
【判断题】
在环中,左零因子与右零因子同时存在或同时不存在。
【简答题】
<img src="http://huaweicloudobs.ahjxjy.cn/22c59da3767668fb3b96fac87af88c39.png"/>
【简答题】
<img src="http://huaweicloudobs.ahjxjy.cn/f7ea044a3017d081fdb4794f7fdd124d.png"/>
【判断题】
直线段的曲率是0,平面曲线的挠率是0。