【单选题】Two long straight wires are parallel and carry current in the same direction. The currents are 8.0 and 12A and the wires are separated by 0.40 cm. The magnetic field in tesla at a point midway between...
【简答题】请从A、B、C、D四个选项中选出此句的主语The direction a hurricane's spiral moves is counterclockwise.A. The direction B. hurricane's spiral C. moves D. counterclockwise