补齐下列三视图中主视图的相贯线，正确的是()。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/4dfbf66553ea474cbdca3437e4fcfd17.jpg
举一反三
- 主、俯、左三个视图中有错误的视图是（）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/a79d241c9ec34ee893719ec162b3779e.jpg
- 正六边形的尺寸标注正确的是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/51b59d5c82e7484292873ae39ff944fd.jpg"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/dad8740e848246faae714a02eb3e79f6.jpg"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/5d7eebc6e83247cd921d440438341839.jpg"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/ef49ee3205524fb5b9fc6c643aef5bad.jpg">
- 图中所示机件的视图中，A局部视图和B向局部视图的画法、标注均正确的是( )。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/7545d6585bd245148481a016edf4d00d.jpg
- 理想运算放大器的主要特征为 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/8ec216c374814f48ad60b00627bee3d6.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/b36e9dfc39a748b1b652e9b3c1a762ed.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/2a93dfdbeb804030ac0da51eed08943e.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/a01ee7baba84489f886c43cc5d5c5169.png" />
- 以下属于典型二阶欠阻尼系统的是。（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/17af3a9e051c466584b8cec615049edd.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/6c04a26728e34a868e6efa4d4043d018.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/7c45b6ba62234c5e978202c49dd4b455.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/8f6cf90035484380beadadba728063ac.png" />