由三个频率相同、振幅相等,相位依次相差()的交流电势组成的电源,称三相交流电源。
参考答案:120度
一中年女性,咳嗽痰多,色白泡沫状,短气喘息,不能平卧.稍劳即重,汗出怕风,纳少脘痞,舌淡脉滑。
若经治未愈,饮郁化热,烦躁而喘。痰黄,粘稠难咯,小便黄,舌红苔黄腻,脉浮者,选用()
A.小青龙汤
B.小青龙加石膏汤
C.麻杏石甘汤
D.桑白皮汤
E.定喘汤
China's sport delegation consisted of 1,454 members, ________ 977 athletes took part in competitions,
making it the biggest number in the history of China in the Asian Games.[ ]
A. in which
B. in that
C. among that
D. among which