A、-30º
B、0º
C、30º
D、150º
更多“ 正弦电压<img src="https://nimg.ppkao.com/2018-08/lina/2018081915442811463.jpg?sign=e57326a2a3e09521f1e092c743591c01&t=62d492f7" />的波形如图所示，则=<img src="https://nimg.ppkao.com/2018-08/lina/2018081915463536795.jpg?sign=b85b7db0730769818db5ef1893e4675d&t=62d492f7" />（）。<br /> <img src="https://nimg.ppkao.com/2018-08/lina/2018081915443662394.jpg?sign=9de5131a5b02ce7861c9a4f83b61e3c6&t=62d492f7" />”相关的问题
A、A.<img src="https://img.ppkao.com/2018-08/lina/2018081916240013633.jpg" />
B.<img src="https://img.ppkao.com/2018-08/lina/2018081916240424865.jpg" />
C.<img src="https://img.ppkao.com/2018-08/lina/2018081916241135122.jpg" />
D.<img src="https://img.ppkao.com/2018-08/lina/2018081916241832814.jpg" />
A、A.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018081609061855082.jpg" />
B.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018081609062737698.jpg" />
C.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018081609063181144.jpg" />
D.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018081609063676713.jpg" />
A、A.S＝P+Q
B.<img src="https://img.ppkao.com/2018-08/lina/2018083117500491800.jpg"/>
C.<img src="https://img.ppkao.com/2018-08/lina/2018083117500988874.jpg"/>
A、A.<img src="https://img.ppkao.com/2018-08/lina/2018083117233188591.jpg" />
B.<img src="https://img.ppkao.com/2018-08/lina/2018083117233741467.jpg" />
C.<img src="https://img.ppkao.com/2018-08/lina/2018083117234149944.jpg" />
D.<img src="https://img.ppkao.com/2018-08/lina/2018083117234896299.jpg" />
A、分析图示电路，当正弦交流电源电压有效值不变，而频率升高一倍时，各安培表的读数将怎样变化？为什么？
<img src="https://img.ppkao.com/2018-08/wenxueying/2018082909250061317.jpg" />
A、图示正弦交流电路中，电压u、u1、u2、u3的关系式可写为u=（）。
<img src="https://img.ppkao.com/2018-08/lina/2018081917524036106.jpg" />
A、<img src="https://nimg.ppkao.com/2018-08/lina/2018081916012858152.jpg?sign=43de63b850a8354b853261e5b3791435&t=62d262ec" /> B、<img src="https://nimg.ppkao.com/2018-08/lina/2018081916013210486.jpg?sign=664e459cf69ed3d956d6c2a9fbdb75ac&t=62d262ec" /> C、Um D、<img src="https://nimg.ppkao.com/2018-08/lina/2018081916013792207.jpg?sign=6a8ec893b21b2692315bf5106255ba17&t=62d262ec" />
A、A.2
B.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120714483545055.jpg" />
C.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120714483937242.jpg" />
D.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120714484469853.jpg" />
A、A.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />三态，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />低电平
B.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />三态，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />高电平
C.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />高电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />高电平
D.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />高电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />高电平
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