稳定是改革发展的前提，和谐稳定的社会是最具竞争力的发展环境。
参考答案：对
—Do you think it wise for Chinese mothers to try to do everything for their children?
—No,that's they're mistaken. [ ]
A. where
B. when
C. so
D. how
A．时刻t线圈中电流的瞬时值icosωt
B．线圈中电流的有效值I
C．线圈中电流的有效值I=
D．线圈消耗的电功率P
cosωt
