题目

Hilton English Language Center Information for New Students CLASS TIME：8:30a.m.—10:00a.m.，10:30a.m.—12:00a.m.，1:30p.m.—3:00p.m.. Language Center is open Monday to Friday. Each class has one afternoon free per week. On the first day, go to the lecture hall to check your timetable. SELF—ACCESS：The language laboratory（Room 1110）is open Monday to Friday from 3:15p.m. to 5:00p.m. for all full-time students. You can learn how to use computers for language games or word-processing（文字处理）. There are tapes for students to borrow to practice their English. Go in and19．如图所示，在探究光的反射定律时，将一块平面镜放在水平桌面上，再把一块纸板垂直放置在平面镜上．（1）实验时让光贴着纸板入射是为了显示光路．（2）如果纸板没有与平面镜垂直放置，当光贴着纸板沿AO入射时，不能（填“能”或“不能”）在纸板上看到反射光．（3）让一细光束沿平面E射到镜面O点，在平面E上可看到入射光线AO，若将纸板F向前或向后折，在纸板F上不能看到反射光线，这说明反射光线与入射光线和法线在同一平面内．（4）为了得到反射角与入射角大小关系的普遍规律，应当进行多次实验，进行多次测量．