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" />

铸铁拉伸实验的MOOC中，需要测试性能指标（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/53667f9a659c4652a1d73a3dd36986bf.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/875d968dec834cdfa4c3fe247d7aa2a8.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/5d8957af2d2a4f51819415939c6345f0.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/b636e1e0d6a94025871bb57705cf25bd.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/6219f1e929704d49b7379c136363c22b.png" />、<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/b542e12f707949e0a011640e81330eea.png" />与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/68fe4ce598db473387b30de3c218f70c.png" />

已知<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/e6d73bcaf9ea43ad8cc6d0448ce5cb54.png" />，其逆Z变换（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/334d49becc544757b952699488a42728.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/4ac8ed87292446f8852ade2dbcaaff0b.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/5f5aa1dfaebe47d788513626d79951af.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/0a7716a303934c79a9af73a051a1a98a.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" />

已知系统函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/e39da45535184440b4f478ab5106f452.png" />，系统微分方程为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/ffc04b8a434a4c00b9143c405784376c.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/2f0eba48174d43b9b307acbb25fff331.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/c8b83cd3d24d48ac9619b499d191fd35.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/2d16a22cef6a4da2b8100854c0707ae8.png" />

在完备的结构式模型<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/c5ce3f82eaef4a8e9b78ac56100488c3.png" />中，外生变量是指( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/3d7fa1fd2a724a31a9dba12982dedd5b.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/c812517c51c44c5bb9f29c45b819050a.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/122d7aec5eda4dabbf983fabc83d73b7.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/d8ee965853364b7b9227f1cc83e46409.png" />

拟合优度被定义为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/50fe08c7b550458a9fd6f079be604b53.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/9bb3c8437ea14207a3dec35c223efef6.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/aedb567ec0934e3d9ef8a934f0118967.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/5efc9dbadec84e28968d639bb2383a43.png">

下列正确表示坐标系的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/4bb4378bbfcd4819855fe50706b1f263.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/fa0ed959ff384f8c91b6b3caca97e663.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/9eff58740cfe4d9dbadffe27f93ac4a6.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/1a25fccdb5b94032998d272c4fe12606.png" />

下列化合物有旋光性的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/cf804a29b076488b9f56bb592d092f6f.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/7c02764f7e0740f19cd3d74d8ffbc232.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/3d95831adf704381891c84ae45dec25b.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/e8a6fe9e6da84c2badca12fbb45599e5.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；