一束光照射到平面镜上,如果入射角是40度时,则反射角是______度.
入射角是40°,由光的反射定律知,此时反射角是40°;
故答案为:40.
Perhaps the biggest difference between Chinese and Westerners is not what we eat, but
w 小题1:we eat it. I’ve noticed that Chinese seem to eat the same food any time of day. To a westerner, this is 小题2:I could never eat rice or noodles in the morning.
Westerners also eat dessert after dinner and it is usually s 小题3:sweet like cakes, ice cream, or fruit pies. Dessert is often my favorite part of the meal, but u 小题4:it is not served in Chinese.
小题5:difference I have noticed is that in Chinese restaurants, everybody at the same table eats the same food. This practice is actually more common around the world, in India and the Middle East for example, t 小题6:in the west where people order a different meal each. I quite like the Chinese way where the meal is s 小题7:. My only problem is with the chopsticks—more of the food ends up on the table than in my m 小题8:.
One thing that surprised me the first time I went to a restaurant in China was the size of the personal plates—they are so 小题9:. It makes sense, though. Chinese don’t need large plates because the food is served in bite-sized pieces that can go straight from the serving dish into your mouth. Westerners have very large plates because there needs to be r 小题10:for all the food to put in at once.
大圆的半径是小圆半径的4倍,大圆的周长是12.56分米,小圆的半径是( )
A.4分米
B.2分米
C.1分米
D.0.5分米