零售渠道的服务对象是______。
己知万有引力常量为G，地球质量为M，半径为R，则地球表面处重力加速度大小为()
Thepresentcrisisbearssome________(similar)totheoilerisisofthe1970s
光的相干条件是光矢量振动的()
Iwouldverymuch______tovisitsomeoftheplacesthatIhavebeenreadingabout.
The_(month)salaryforthepositionwillbenegotiableataround$2,000.
