问答题

空间曲线，在点处的法平面必（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/bfc647dd12e84c118c466425a1312203.png

答案：平行于轴http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803...

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曲线在点的切线一定平行于（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/6cb33e65643e463d85cf64fddaa5b376.png

答案：平面http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/6...

设有连续的偏导数，且，则=（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/63eb2ad0bac447489cbf8cbb923d3692.png

答案： 1===