【单选题】电力系统发生三相短路时,短路电流( ) A、由负荷流到短路点; B、由电源流到短路点; C、由电源流到负荷; D 不清楚
【单选题】听力原文:M: I don't share your enthusiasm for automobile racing. W: If you had been with us, Stanly, you would have understood our excitement. Q: What do we learn from the conversation? (18)
A.
The woman had been to the race and she was very excited.
B.
The man had been to the race and he was very excited.
C.
Both of them had been to the race and were very excited.
D.
Both of them had been to the race but the woman was not excited.
【简答题】奥迪01J无级变速器主要由哪几部分组成?
【单选题】听力原文:W:I wish my hair were longer. M:Yes,it's a pity you had it cut.If only you'd listened to me. Q:What can we learn from the dialogue? (18)
A.
The man didn't want the woman to have her hair cut.
B.
The woman followed the man's advice.
C.
The woman is wearing long hair now.
D.
The man didn't care if the woman had her hair cut.
【简答题】某放大器幅频特性波特图如下图 ,则其中频电压增益为 __________dB,通频带为____________,在上限频率下的电压增益为__________dB;影响其高频响应的主要因素有________________,影响其低频响应的主要因素有__________________。
【多选题】经炽灼、遇醋酸铅试纸生成黑色硫化铅沉淀的药物有
【多选题】经炽灼、遇醋酸铅试纸生成黑色硫化铅沉淀的药物有