设，矩阵，，其中E为n阶单位阵，则BC等于().http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/639791db15504432a1d753ce6bddbdfa.png

下面不属于移植设计的案例是？ A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/9fa6d465b6914dc18886ae7dbcedfa7c.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/fdccc4977be440358387da7085f6a886.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/53e768bc11704cac931eb940f1f37461.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/4dc8cde899fe4008bbef5a9db1bfb34d.png"/>

设，则A的谱半径________.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/ae166ab2c3c940a2815ed79c253e1565.png

已知轴的主视图，根据标注选择所对应的正确的断面图，其中正确的B-B是（ ）。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/fb36fa86ece84fbcbc0f2230abb855ad.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/0310f38d6cfc4fdd8b4d527907f732a3.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/dba503dc28c741698b1cf083200d24ad.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/1b977d55d6a84bceb9e6c39b7f9d878c.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/82093ffe849a4e789e46eaf4c768a318.png" />

用Euler法求微分方程<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/624c4b8f8dca46c7bef22714e1ed1722.png" />数值解，取步长<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/a13d85bddaeb4fcd9917aa25748d2e7c.png" />，则<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/70cf8bfe9dc142c6b500f50abf025d17.png" />的计算值为_______. A: 1.94 B: 0.84 C: 0.94 D: 2