更多“ 由解析式<img src="https://nimg.ppkao.com/2019-04/tangling/2019042410211167454.jpg?sign=77cb82b9d8549720115c43f1debd0237&t=62d71f2b" />知：当经营杠杆系数趋于无穷大时，企业的营业利润率为零。”相关的问题
A、波动表达式<img src="https://img.ppkao.com/2018-09/wangjing/2018092717084368078.jpg" />中，<img src="https://img.ppkao.com/2018-09/wangjing/2018092717090133182.jpg" />表示（），φ表示（），若把上式改写成<img src="https://img.ppkao.com/2018-09/wangjing/2018092717092117604.jpg" />则<img src="https://img.ppkao.com/2018-09/wangjing/2018092717094258534.jpg" />表示（）。
A、A.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />不变，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />增大
B.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />减小，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />不变
C.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />减小，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />增大
D.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />增大，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />减小
A、A.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042917175712037.jpg" />
B.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042917180085132.jpg" />
C.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042917180310884.jpg" />
D.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042917180684437.jpg" />
A、A.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041213433598909.jpg" />
B.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041213434018690.jpg" />
C.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041213434550659.jpg" />
D.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041213434921699.jpg" />
A、A.<img src="https://img.ppkao.com/2017-07/lizhangyong/2017072013113275935.png" />
B.<img src="https://img.ppkao.com/2017-07/lizhangyong/2017072013113719356.png" />
C.<img src="https://img.ppkao.com/2017-07/lizhangyong/2017072013114039900.png" />
D.<img src="https://img.ppkao.com/2017-07/lizhangyong/2017072013114435190.png" />
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
A、已知交流电压的解析式：u1=10<img src="https://img.ppkao.com/2018-08/lina/2018083117113649640.jpg" />sin（100πt－90°） V，u2=10sin（100πt＋90°） V，则它们之间的相位关系是（）。
A、A.<img src="https://img.ppkao.com/2018-04/zhouyun/20180412175605391.jpg" />
B.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217562114745.jpg" />
C.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217562651092.jpg" />
D.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217562929580.jpg" />
E.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217563332745.jpg" />
A、A.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516571386102.jpg" /><img src="https://img.ppkao.com/2018-08/chenfang/2018081516572558372.jpg" />
B.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516572062708.jpg" />
C.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516572915872.jpg" />
D.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516573482159.jpg" />
A、A.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116564316705.jpg" />
B.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116564929545.jpg" />
C.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116565492959.jpg" />
D.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116570158166.jpg" />
E.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116570766172.jpg" />
F.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116571469081.jpg" />
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