室外刮很大的北风时，把玻璃窗打开一条缝会听到呼啸的声音，这是由于______振动而产生的．
呼啸声是由于玻璃窗振动产生的．
故答案为：玻璃窗．
Which of the following positions is most appropriate for a neonate with congenital hip dislocation ？（）
A．Semi-Fowler's with both legs flexed.
B．Legs adducted with head elevated.
C．Swaddled in a baby carrier.
D．Prone position with hips abducted.
相线与相线之间的电压称为线电压。
