17.3光程薄膜干涉 一、光程 光在真空中的速度c=1u1 光在介质中的速度u=1ucn

17.1光源相千光 一、光和光波的波动方程 光是一种电磁波

一、两个同方向同频率简谐运动的合成

14-4单摆和复摆 一、单摆

成都理工大学：《大学物理》课程教学资源（PPT课件）第十四章 机械振动（14.2）简谐振动中的振幅、周期、频率和相位

成都理工大学：《大学物理》课程教学资源（PPT课件）第十三章 电磁感应、电磁场（13.5）磁场的能量磁场能量密度

till after, from behind, except in We stayed there till after the sunset He picked up the gun from behind the counter The weather has been fine except in the north

1全部倒装( Full Inversion,又称主谓倒装 (Subject-verb Inversion) 例如: Here are some letters for you Down poured the rain Into the coach scrambled the children

1. If you had come earlier, you the famous scientist a could be met b. might meet c would have met d. would meet

Test 1 Directions: Choose from A), B, C and D) the best answer to complete each of the following sentences 1. No one takes him any more, he's become a figure of fun A)earnestly B)seriously