A:减小、增大、减小 .
B:增大、减小、减小
C:减小、增大、增大、
D:增大、减小、增大
如图,用直尺和圆规作出∠AOB的角平分线OC的依据是( )
As teenagers, we're old enough ________ with housework. We can help set the table, wash the dishes and clean our own rooms.
如图所示,把饮料管甲插入盛水的杯中,另一根饮料管乙的管口贴靠在甲管的上端.往乙管中用力吹气,甲管中的水面将 ____(填“不变”、“上升”或“下降”).管口端A点的压强为pA,杯中水面处B点的压强为pB.则pA ____pB(选填“>”、“=”或”“<”).