如图所示为一直角三棱镜截面，∠A=30°，∠C=90°，BC边长为L．一足够大的光屏MN平行于BC竖直放置．以MN为y轴建立如图所示直角坐标系，B点坐标为（-L，0）．在0＜y＜L的范围内，一簇平行于AC的平行光射到AB面上．过AB中点的光线经AB面折射后恰好射向C点．
Ⅰ．求该棱镜的折射率．
Ⅱ．求光屏上有光照射到的坐标范围．
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My wife and I went to a supermarket, there we bought some cold drinks and cakes. After we came out of the supermarket, we noticed that in the front of the supermarket was a nice little garden with benches for people relax on. We sat there and started enjoying the things we have just bought. There was ten small cakes in the bag and we couldn’t eat all of it. I wanted to share, but of whom? A young boy appeared. He was looking into the trashcan for nothing to eat. We had just finished three of the ten cakes. So, I took the remained pieces and gave them to him. He thanked me and ran away in a happily mood.
如图所示，从地面上方某点将一物体以 20m/s的初速度沿水平方向抛出，抛出点距离地面的高度h为20m．则物体落地点与抛出点的水平距离x为______m；物体落地时的速度大小为______m/s．（不计空气阻力，取g=10m/s2）
塑料填塞型盒的最佳时期为（）
A.粘丝期
B.橡胶期
C.坚硬期
D.湿砂期
E.面团期
流感病人的飞沫、流感病毒分别属于
A．传播途径、病原体
B．传染源、病原体
C．易感人群、病原体
D．传播途径、传染源
在确定进口货物完税价格时，如果进口货物的保险费无法确定或未实际发生，( )。
A．海关应当按“货价加运费”总额的3‰计算保险费
B．海关应当按“货价加运费”总额的0.3‰计算保险费
C．海关应当按“货价加运费”总额的3％计算保险费
D．海关应当按“货价”总额的5‰计算保险费