【单选题】【消耗次数：1】
一直角形杆件绕定轴转动，在图示瞬时其转动的角速度为w，角加速度为e，它们的方向如图所示。以下四图所示，杆上点B的速度、切向加速度和法向加速度的方向，哪一个图是完全正确的
①
<img src=https://huaweicloudobs.ahjxjy.cn/82B72475BC6826C209754D692095F389.png style= title=1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/25EF8EC5F41FB1D5BC7943CEC3B30C83.png title=2.png style=white-space: normal;/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/2E056DE8215AB397C1CC75DBB9A999DA.png title=3.png style=white-space: normal;/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/C80981399A6BABEF1354DE66EB9E1B25.png title=4.png style=white-space: normal;/>
参考答案：
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随机题目
【单选题】
购物车的信息必须要存储下来,以供顾客后续检索使用,一种识别用户并保存其选择的方法是(?).??
①
生成并保存SSL?
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生成并保存Cookie?
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生成并保存EFT?
④
生成并保存Active?
【多选题】
符合以下毕业条件的学生可以获得武汉理工大学毕业证书。
①
具有正式学籍的学生
②
在学校规定的学习年限内，修完培养计划规定的全部课程并完成规定的实践性环节，成绩合格
③
取得规定的学分，一般学生需修读总学分不低于85学分，专升本学生需修读总学分不低于90学分
④
网络专升本学生除上述条件外，须参加国家组织的大学英语和计算机考试，成绩合格