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  • 2022-07-25
    下列关于极值命题中正确的是（）
    A: 若，则必是的极值点
    B: 若，则必是的极值点
    C: 极大值一定大于极小值
    D: 若存在且是极值点，则必有
    • D
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    • 0

      有一段距离，其观测值及其中误差为<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/955e74e32ce34326bdef41ac92072428.png" >，这个观测值的真误差的实际可能范围是（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/bfa41dfe10ae4573a7330618be9a2d68.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/678e81221188413e98d0eb203cc923d1.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/c105a1d6bdc84db494d58aebe03aded0.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/949892fc01a74c8188fdcf6e1aa59ad0.png" >

    • 1

      图示刚架,结点A承受力偶作用，EI=常数。用力矩分配法求得AB杆B端的弯矩是：（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/7f7f4973567d4fe1bba22dcfda90576b.png"> A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/924668c9b6164abf9ce5f8408ce20881.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/7138e815e3484afc811e172c08c9c5ed.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/e69f09485ad04e40851c731afb2381a2.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/33f68a0494134087b303dd17cfaca7b1.png">

    • 2

      有6本中文书和4本外文书，任意往书架摆放，则4本外文书放在一起的概率是(). A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/a134393932b84674ba322b5f9497f589.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/ca652e863e0d486b9d28fa71d8427dbf.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/50aacfa724d4470ca1fc065813e47e39.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f681e33f0f9849a0a444a4ecfc9db061.png" >

    • 3

      受弯构件正截面承载力中，对于双筋截面，下面哪个条件可以满足受压钢筋的屈服（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/d5963dbd0ecc4479a508fc9d5ef9db66.png" >； B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/c39d0160788a42fba2be8719a4a24649.png" >； C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/a10be250dcbb47bd88acd7acbea22745.png" >； D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/843ba06116ac46199d56b6d8d4200733.png" >；

    • 4

      单元刚度矩阵中元素<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/4b8d3c048bf344ea8cb72564e50f8b96.png">的物理意义是：（） A: 当<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/799278dd2f3c446b92ad68711d98763e.png">时引起的<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/4c8756cce17b474f8088c7e45544c233.png">相应的杆端力 B: 当且仅当<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/799278dd2f3c446b92ad68711d98763e.png">时引起的与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/4c8756cce17b474f8088c7e45544c233.png">相应的杆端力 C: 当<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/2c2e6d24cad2454aa084e058690fa153.png">时引起的与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/e9f5dfcac2cf4330a3a9a1d9ade1c07a.png">相应的杆端力。 D: 当且仅当<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/2c2e6d24cad2454aa084e058690fa153.png">时引起的与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/e9f5dfcac2cf4330a3a9a1d9ade1c07a.png">相应的杆端力