Heblamedhispoorperformance_____jetlag

The_(month)salaryforthepositionwillbenegotiableataround$2,000.

两列波的表达式分别为y1=cos2Avtx(/)和y2=cos2Avtx(/)，两波叠加后在坐标原点x=0处的振幅为()

_______(safe)needstobeimprovedontherailwaysinthatcountry

Hecouldnot________histearsonhearingthathewasnotadmittedtotheuniversity