题型:判断题 直径25mm与50mm的两个圆棒,通以相同的轴向电流进行磁化,圆棒表面的磁感应强度将是()。A.两圆棒相同B.φ50mm的圆棒较强C.φ25mm的圆棒较强D.φ25mm的圆棒较弱 查看答案
题型:判断题 If you wished to transmit a message by voice concerning the safety of navigation,you would preface it by the word().A.MaydayB.Pan-panC.SecuriteD.Safety 查看答案