某电流相量形式为=(3+j4)A,则其瞬时表达式为。()https://p.ananas.chaoxing.com/star3/origin/c12aeb6e9a2e970f0545ae96d38bdc76.pnghttps://p.ananas.chaoxing.com/star3/origin/ecdaa59ea96bb695a0bd74e716dc1226.png
举一反三
- 使,,,的值为https://p.ananas.chaoxing.com/star3/origin/7a71315286a845cd71d58a43d172d70e.pnghttps://p.ananas.chaoxing.com/star3/origin/82992dfd55feeb0dbc3accfc460e8e6f.pnghttps://p.ananas.chaoxing.com/star3/origin/d072c844f7cfa56460a42ea3424f0622.pnghttps://p.ananas.chaoxing.com/star3/origin/d03cce0f654cef79e0f8e9e14f223092.png
- 设是圆,则https://p.ananas.chaoxing.com/star3/origin/d8b5edc9a2457c461a3685877f8606ab.pnghttps://p.ananas.chaoxing.com/star3/origin/5f3c1256fa1597901980dc868dfb57f7.pnghttps://p.ananas.chaoxing.com/star3/origin/1932e2a8e9452d4d6f94177a0ca40384.pnghttps://p.ananas.chaoxing.com/star3/origin/5785decddcc5b175015fc7c46d4d8405.png
- 设,,矩阵,则秩 ____。https://p.ananas.chaoxing.com/star3/origin/37ef575fe498777db654afddca62fe2c.pnghttps://p.ananas.chaoxing.com/star3/origin/a615458f7dcae581d0fff21cde15a403.pnghttps://p.ananas.chaoxing.com/star3/origin/290ba9cd94f47cfdfb6c2f491dc6ba09.pnghttps://p.ananas.chaoxing.com/star3/origin/4552fd27a3592e03f9b28737ec534441.png
- 在 中, , ,则 等于https://p.ananas.chaoxing.com/star3/origin/98366284d8feecd580613938380206ea.pnghttps://p.ananas.chaoxing.com/star3/origin/526e25c58361a406de96a44862df7aba.pnghttps://p.ananas.chaoxing.com/star3/origin/04970d84ab61ade1077625be94ccdd96.pnghttps://p.ananas.chaoxing.com/star3/origin/7a34359614a39bd8fbffa909e85a630f.png
- 一质点在平面上做一般曲线运动，其瞬时速度为 ，瞬时速率为 ,平均速度为 ,平均速率为 ，则它们之间必定有关系为______________。https://p.ananas.chaoxing.com/star3/origin/8316467fe0733b027c20c6cb52e56f39.pnghttps://p.ananas.chaoxing.com/star3/origin/8f1af5311c1ab61d5f9b5cc5e1fef994.pnghttps://p.ananas.chaoxing.com/star3/origin/54aa188889f014f0348d65d01c87162a.pnghttps://p.ananas.chaoxing.com/star3/origin/22feeec5a0616b477e26db1686162538.png