【简答题】图2-6所示的电桥电路中,已知电阻 R 1 、 R 2 和 R 3 中的电流分别是 25mA 、 15mA 和 10mA ,方向如图中所示。那么流过电阻 R 4 、 R 5 和 R 6 种的电流大小分别是 、 和 ,并在图上标出电流方向。
【简答题】(U1 Listening)Task 1 Mr. Black is a call to pre-register at a hospital. Listen to the conversation and choose the best answer to each question you hear.
【单选题】实验一万用表中图C-1的4个电阻R3、R4、R5、R6是_______联。
【简答题】News 1 Vocabulary 1. Hall of Fame a building which contains images of famous people and interesting things that are connected with them 2. Underground Railroad the Pre-American Civil War anti-sla...