The teacher required that all errors should be _______eliminated before the students turn in their term paper
Decision makers must have some way of determining of several alternatives is best.（）
一质点沿x轴作振幅为A的简谐振动，当t=0时，质点的位移恰好为x0=A.若振动的运动学方程用余弦函数表示，则质点振动的初相为()
Although they agree that life is important and should be respected, they feel that the quality of life should not __(ignore).
两个同方向、同频率、同相位的简谐振动，振幅均为A.则它们合振动的振幅为A'=____________.
