【简答题】P: Hello. Can I have the 1._____(紧急出口处的座位) please, so that there is 2._____(更宽敞) for my daughter and me? C: Sorry, madam, that's 3.______(不允许的) because you are 4.______(携带婴儿旅行). Anyone who wants to se...
【简答题】分压器线路 (1)按图3-3接线,稳压电源电压US取12V,可变电阻器RP接成分压器线路,负载电阻RL由电阻箱获得,取值为500Ω。 (2)闭合开关S1和S2,移动可变电阻器RP滑动触头C,使Rx分别为0、Rp、Rp,Rp=1k,测量各对应的电压U1、U2和电流I1、I2、I3,记入表2中。 表2 数据 Rx R L U 1 U 2 I 1 I 2 I 3 0 500 1/2 Rp 500 Rp ...