指数平滑法预测时，假定我们希望预测值更多地依赖实际值，则平滑系数
应该（ ）
A: 取大一些
B: 取小一些
C: 取0.5
D: 取得适中一些
应该（ ）A: 取大一些
B: 取小一些
C: 取0.5
D: 取得适中一些
举一反三
- 指数平滑法预测时，假定我们希望预测值更多地依赖实际值，则平滑系数[img=64x58]17d602caac2d56a.png[/img]应该（ ） A: 取大一些 B: 取小一些 C: 取0.5 D: 取得适中一些
- 真空中一点电荷q位于一立方体中心，则通过立方体每个表面的电场强度通量为（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/378c1524c7344e0ca9da40d27d574ecb.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/1a46a07ef57546b7a635c5569c072fe6.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/42f4c341336c496c9307a3ce5f34f0f7.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/97013f5b870e46699ecef95a2f26e6e7.png" />
- 判定系数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/884048ab090f4001856b6b5be7ce702d.png" />可表示为( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/595552013f6f4712972e25f5205785e3.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/448d29a283a1437e972417c64c9186ba.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/0757164fbffa45a7afd4984db734d818.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/c804edbb8d30463a9074d63b355031d0.png" />
- <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/4d6959efe5f94bb690c25c1a7f6cf7ec.png" />点在三向应力状态中，若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/3b70ba8af50b4b4ea00548dd54c64647.png" />，则关于<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/4e33f2cc7385440cb6b016dd85db79ad.png" />的表达式有以下四种答案，正确答案是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/6fc49ba4cd4b4054aaf6cd6e92f5c678.png" />； B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/cc792d5eb3b5437692fd66a12aac7f09.png" />。 C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/e680eb44d5124e1999c29940899f2f4a.png" />； D: 0；
- 铝合金拉伸实验的MOOC中，需要测试性能指标（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/418dff8a904f4789899ce32e4cd03b74.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/411578dcfdda41a3bc8821b9bfb1d916.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/806ea04e59cd436faec9f7992d126ee5.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/61011c7d884349459d41d9f3670d7d0e.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/57ab5cc8b9dd4fb0961726058a6e9c52.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/806ea04e59cd436faec9f7992d126ee5.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/61011c7d884349459d41d9f3670d7d0e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/32ff0f454bde4334ae385089a853b9ac.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/ab0315aab0fa4918a53714026df50fa3.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/806ea04e59cd436faec9f7992d126ee5.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/61011c7d884349459d41d9f3670d7d0e.png" />