未知题型 If you don't want to bid for something on the auction list, you click 'Buy It Now.' to get it.A.YB.NC.NG
单项选择题 对于电压串联负反馈，反馈系数F的量纲为（） A. 电阻 B. 电导 C. 无量纲 D. 安培
未知题型 The word 'juicy' in the last sentence of the second paragraph most probably denotes ______.A.succulentB.interestingC.lucrativeD.liquid