推拿基本治法中,补法的操作要求是()
A.手法轻而柔,不宜过重刺激
B.刚柔兼施
C.手法稍重逐渐加强
D.轻快柔和,频率逐渐加快
E.以上都是
参考答案:A
Is this the reason ____at the meeting for his carelessness in his work?
A.why he explained
B.what he spoke
C.he explained
D.he spoke
如图所示,理想变压器的原、副线圈匝数之比为10∶1,R1=20Ω,R2=10Ω, C为电容器,原线圈所加电压u=220sin100πt(V).下列说法正确的是.
A.原线圈的电流为0.33A
B.电阻R2的电功率为48.4W
C.原、副线圈两端交变电压的频率比为10:1
D.原、副线圈铁芯中磁通量变化率之比为10:1