About 90% of American students go to __________ schools and 10% attend ___________ schools.
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The goal of education in the United States is to achieve universal _________ and to provide individuals with the knowledge and skills necessary to promote the welfare for individuals and the general public.
23、若电路中某元件两端的电压u=36sin(314t-π/2)V,电流i=4sin(314t)A,则该元件是( )。
A.电阻
B.电感
C.电容
24、计算复杂电路的基本定律是欧姆定律和( )定律。
A、节点电流
B、回路电压
C、楞次
D、基尔霍夫
25、目前低压供电系统多数采用( )供电系统。
A.三相三线制
B.三相四线制
C.三相五线制
D.单相制