【简答题】(湖南大学2006年考研试题)图16—50所示电路,已知二端口网络的Z参数为Z11=12Ω,Z12=8Ω,Z21=8Ω,Z22=20Ω。试求电压 。
【单选题】已知函数 .若 ,且 ,则 的取值范围是 ( )
【单选题】What does the man think of the price?
C.
It is quite reasonable.
D.
It is dear for economy class.
【简答题】题如图所示电路中,已知铁心由铸钢制成,其截面积各处均为16cm 2 ,铁心部分的平均长度ι 1 =50cm,磁路中的磁通φ=8×10 -4 Wb,ι 0 =0.8cm,试计算磁路所需的磁通势以及各段磁路所需的磁通势占总磁通势的百分比。
【判断题】The interaction and bilateral influence of the agricultural society and the nomadic society promoted the development of Chinese culture.
【多选题】在评价健康投资的经济效益时,美国的西尔曼莫希金讨论了以下哪些评价方法
【单选题】What does the speaker think of today's world?
A.
It is very commercial.
D.
It is very unfriendly.
【简答题】电路如题图所示。已知16V电压源发出8W功率。试求电压U和电流I及未知元件的功率,并判断是吸收还是发出功率。
【单选题】What does the farm look like?
B.
It is not very big but very nice.