空间曲线<img src="https://zk.995w.com/lqwvjeImg/0b/0bbb6a51d0d3a6675bf480115e319a3a.png"style="width:94px;height:69px;">上点<img src="https://zk.995w.com/lqwvjeImg/de/de001187c859a068a446ea80be39d01b.png"style="width:78px;height:53px;">处的切线与<img src="https://zk.995w.com/lqwvjeImg/9a/9ac2edf1f1ea672008e2d8acfd7be1b1.png"style="width:24px;height:18px;">轴正向的夹角<img src="https://zk.995w.com/lqwvjeImg/bf/bf7ab8f6b0db02192b99c234bf894b44.png"style="width:28px;height:14px;">( ).<br>· <img src="https://zk.995w.com/lqwvjeImg/72/724e178d41a9e89efb795514da0d1bbe.png"style="width:17px;height:41px;"><br>·<img src="https://zk.995w.com/lqwvjeImg/8f/8f01d95d3940cc30836884131fe09b8b.png"style="width:17px;height:41px;"><br>·<img src="https://zk.995w.com/lqwvjeImg/9e/9e0dedd94a36954079da92e5573e38ff.png"style="width:17px;height:41px;"> <img src="https://zk.995w.com/lqwvjeImg/63/63d3c91fe9f4a8a397c08c733b4b191c.png"style="width:37px;height:21px;"><img src="https://zk.995w.com/lqwvjeImg/b7/b74b5c90ca9c8d521fd536fdb1938da5.png"style="width:28px;height:41px;">