发电厂供应的交流电是按正弦规律变化的。
参考答案：对
按无牙颌组织的分区，上颌隆突属于（）。
A.主承托区
B.副承托区
C.边缘封闭区
D.缓冲区
E.后提区
What she went through those years ________ the best in her,such as patience and will power．
A．brought up
B．brought out
C．brought about
D．brought down
