【简答题】在图7-11所示电路中,R=20Ω,ωL 1 =0.625Ω, ,ωL 2 =5Ω,外施电压为 u(t)=(100+27nωt+100sin3ωt+50sinθcot)V 试求i(t)和它的有效值。
【单选题】第一艘在中国运营母港航次的国际邮轮是( )。
【单选题】请用电源的等效变换法求解。图T11-1所示电路中的I为( )。
【单选题】The __________ will dictate how long a speech should be.
【单选题】Though he did not ________ his speech to the audience, he went at a pace slow enough for the listeners to take down a lot of what he said.
【判断题】一般而言,宣传者的权威性与宣传效果成正比。
【单选题】The __________ will usually dictate how long a speech should be.
【单选题】The __________ will dictate how long a speech should be.