总电压一定,多个电阻串联时,各电阻上的电压与电阻值成正比,其功率与电阻值成反比。
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电阻的串联实现分压,电阻的并联实现分流。
A. 对
B. 错
端口电压不变,并联的负载电阻愈多,则总电阻愈小,电路中总电流和总功率也就愈大。
A. 对
B. 错
不定积分的第二换元法根式代换和三角代换都是为了消除根号,方便使用积分公式求原函数( ).
A. 对
B. 错
Work in pairs. The first person reads what Sheila says, and the second person gives a possible appropriate answer from learned materials or using his/her own words. You may want to write your responses on a piece of paper.Example:Student A:Hello. May I sit next to you?Student B:Of course you can.orHi, my name is…