ThegoodsunderL/CNo.1234lefthere_.
A、inagoodconditionApersonisluckyifhiscareer________withhisinterestandhobby
Expertshavefoundthatnormalsleepcanbedividedintofive______stages
小球從高為h處以初速度v0落下,撞擊地面后反彈,回到出發點處速度大小仍為v0.在此過程中小球與地球組成的系統的()
Let’spersonalfeelingsinmakingjudgment.()
單色光垂直入射到每毫米500條刻痕的光柵上.若入射光波長為5.0×10-7m,求第二級主極大的衍射角;