题目内容

In the United States school systems, which of the following divisions is true?

A. Elementary school, grammar school.
B. Elementary school, junior high school.
C. Elementary school, secondary school.
D. junior high school,senior high school.

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About 90% of American students go to schools and 10% attend _ schools.

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