【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】
我国能源利用率为33%，比国际先进水平低10个百分点，主要产品单位能耗平均比国际先进水平高40%。这启示我们（ ）。
①
A要尽量减少对能源的利用
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B要加快企业的兼并联合
③
C必须提高经济增长速度
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D必须提高能源的利用效率
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当前，国家安全问题日益受到关注。习近平同志强调，必须以（ ）为宗旨，以政治安全为根本，以经济安全为基础，以军事、文化、社会安全为保障，以促进国际安全为依托，走出一条中国特色国家安全道路。
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A人民安全
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B政党安全
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C国家安全
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D生态安全