【简答题】RLC 组成的串联交流电路,接在电源电压为 V ,电阻 R=30Ω ,电感 L=382mH ,电容 C=40μH ,则电路的 有功功率 P=____w, 功率因数 λ=_____ 。(除不尽的数字小数点后保留1位有效数字)
【简答题】Who are the two boys? Nora was six years old. She had a little brother. Her brother's name was Jim. Jim was sometimes naughty, but he made Nora laugh a lot, and she loved him and was always very n...
【判断题】刚性防水屋面中水泥可使用火山灰质水。( )
【简答题】RLC组成的串联交流电路,接在电源电压为 V,电阻R=30Ω,电感L=382mH,电容C=40μH,求电路中的电流 、有功功率P,功率因数λ。
【简答题】RLC 组成的串联交流电路,接在电源电压为 V ,电阻 R=30Ω ,电感 L=382mH ,电容 C=40μH ,则电路的 有功功率 P=____w, 功率因数 λ=_____ 。(保留1位有效数字)
【单选题】RLC组成的串联交流电路,接在电源电压为 V,电阻R=30Ω,电感L=382mH,电容C=40μH,求电路的功率因数λ。
【判断题】刚性防水屋面中水泥可使用火山灰质水泥。( )
【单选题】人体的八大系统中,具有调节人体活动功能的是
【简答题】3 ________ was your grandmother like? ~ She
was very ________ - she always helped everyone. And she was ________ too. She
went to university.
【单选题】人体的八大系统中,具有调节人体活动功能的是( )