【简答题】如图所示电路为对称三相电源供电给两组负载,已知对称负载Z=10+j10Ω,不对称负载Z A =Z B =30Ω,Z C =-j30Ω,电源线电压U L =380V,求电压表读数。
【简答题】第60题 What should applicants undertake not to do? Associate their response and participation with any of their __________.
【简答题】已知集合A={x|x-2≥0},集合B={x|a-1<x<a+1 }; (Ⅰ)已知a=2,求A∩(C R B); (Ⅱ)若B?A,求实数a的取值范围.
【单选题】已知集合A={x|x≥2},B={x|-1
【简答题】根据以下材料回答 56~60 : 第 56 题 What should you do to protect your computer from a virus? You must make sure that you have an______________.
【单选题】已知集合A={x|-2<x<1},B={x≤-2},则A∪B=( )
【简答题】下面,请回答 17~20 题。 第 17 题 According to the speaker,what should the listeners do as soon as possible?