下列结论中正确的是 ( ) A: 若数列<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/10b6bba1227b44138c6e945a1ed39646.png" />收敛, <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/803155493fdb46e9b6b97337cac5963f.png" />发散, 则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/b76a24d54cd14797b9d73350fb8fd255.png" />和<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/44f12c63e34f42de8a3d486c40cc0f8b.png" />均发散 B: 若数列<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/0ecfc168d33a4819870d7deec580bf4d.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/2b6a72dab9df455b8483d47797e10ca2.png" />收敛, 则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/96d1b9dbd68b4aa69eecfb1e7180d366.png" />和<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/2879af37195b495cb749871dcb11bf75.png" />均收敛 C: 若数列<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/85b08f06cfec4fa6a7f1e4758789a28f.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/f19f0281807047ca99dab5b88bbc3e32.png" />发散, 则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/a0fa01d49100430a939dedf78ec71ea7.png" />和<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/7634f23c1d5946dba3898912cd26e639.png" />均发散 D: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/4540a2e9908b4300b71f780481e0cfbf.png" />, 则必有<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/39287aa060f74d46a6d7fd3b54fd24b3.png" />或<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202110/b19925d5d7114e3398d729bb58d6fc4a.png" />

考虑AR(2)模型<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/9c19d336a086430cab947cf3a40c8047.png" />,则AR特征方程的根为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/b8d42e894377426eaca4f3a382c0569c.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/cb2410db797c4dc5870eb9ab1dfae59e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/505155f9e5654d3294291a0f104fd54f.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202105/ff900163e913414384b61dbd55a0c36e.png" />

下列结论错误的是（） A: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/4a3d4acefd7f4477a8e87e2ae428b31a.png">处连续，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/091d1b1af4704a85b8293d2fd567adbf.png">处可导. B: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6a503657edf44fb88c8b115537832ae.png">处不连续，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/091d1b1af4704a85b8293d2fd567adbf.png">处不可导. C: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6a503657edf44fb88c8b115537832ae.png">处可导，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/091d1b1af4704a85b8293d2fd567adbf.png">处连续. D: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6a503657edf44fb88c8b115537832ae.png">处不可导，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/091d1b1af4704a85b8293d2fd567adbf.png">处也可能连续.

下列关于极值命题中正确的是（） A: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/66e36e20da3f43e9bbd9ce0f42dcbe28.png">，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/9d60dd3351b54052b4f4afe27423a0e7.png">必是<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/53f1ecb5821b44f1a56bbc836e49d9b7.png">的极值点 B: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/0a40a2ad34e649e3b999f776e8fe1919.png">，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/9d60dd3351b54052b4f4afe27423a0e7.png">必是<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/53f1ecb5821b44f1a56bbc836e49d9b7.png">的极值点 C: 极大值一定大于极小值 D: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/31b1a07ab57347febde3751859364dfb.png">存在且<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/9d60dd3351b54052b4f4afe27423a0e7.png">是极值点，则必有<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/66e36e20da3f43e9bbd9ce0f42dcbe28.png">

已知10箱产品中有8箱次品率为0.1，2箱次品率为0.2，现从这批产品中任取一件，则该件产品是次品的概率为（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/837e9ce6309b444c987c0de8493c5706.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/acc5ae591cba42eca4c4b7fbbcc590a6.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e6ceeed836d84a7aa08fed75b432f4d3.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/a947488c7cbf4e469e7d1766a3a1f7df.png" >