已知两个正弦量分别为<img src="https://zk.995w.com/lqwvjeImg/1b/1bb55afa5d9af5842bbaf75aa7a934d0.png"style="width:209px;height:32px;">,<img src="https://zk.995w.com/lqwvjeImg/b1/b1e934137c0eb32d74a8420b23c02538.png"style="width:212px;height:32px;">,则 () 。<br>·i1比i2超前<img src="https://zk.995w.com/lqwvjeImg/09/09222bcdbc0834b856ec175baefd2275.png"style="width:36px;height:28px;"><br>·i1比i2滞后<img src="https://zk.995w.com/lqwvjeImg/09/09222bcdbc0834b856ec175baefd2275.png"style="width:36px;height:28px;"><br>·不能判断相位差