皮皮学，免费搜题
登录
搜题
【单选题】
如图所示是光在光纤中的传播示意图，图中n0是空气折射率，n1是光纤纤芯折射率，n2是光纤涂覆层折射率，根据图中所示信息，（ ）表示光纤的受光角。【图片】A.
0
B.
1
C.
2
D.
1
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】听力原文： When Midori was two years old, she often climbed onto the piano bench and reached for the violin that belonged to her mother, a 38-year-old professional musician. 'Please don't touch, Midori', h...
A.
A housewife.
B.
A singer.
C.
A teacher.
D.
A musician.
【简答题】Elle: What’s the point (1) ,Paulette, I mean, all people see when they look at me is blond hair and big boobs. No one’s ever gonna(2) . People at law school don’t. Warner doesn’t. I don’t think (3)...
【单选题】听力原文： When Janet was two years old, she often climbed onto the piano bench and reached for the violin that belonged to her mother, a 38-year-old professional musician. 'Please don't touch, Janet, 'her...
A.
A housewife
B.
A singer
C.
a teacher
D.
A musician
【单选题】听力原文： When Midori was two years old, she often climbed onto the piano bench and reached for the violin that belonged to her mother, a 38-year-old professional musician. 'Please don't touch, Midori,' h...
A.
A housewife.
B.
A singer.
C.
A musician.
D.
A teacher.
【单选题】听力原文： When Midori was two years old, she often climbed onto the piano stool and 'reached for the violin that belonged to her mother, a 38-year-old professional musician. 'Please don't touch, Midori,' ...
A.
A housewife.
B.
A singer.
C.
A teacher.
D.
A musician.
【单选题】控制图的主要用途是( )。
A.
评价工序的质量特性 B ．发现不合格 C. 及时反映和区分正常波动和异常波动 D ．显示质量波动分布的状态
B.
发现不合格
C.
及时反映和区分正常波动和异常波动
D.
显示质量波动分布的状态
【单选题】听一段对话，回答第1小题。 1. Why didn't Simon go to the movie?
A.
He was late.
B.
He lost his ticket.
C.
He forgot the time.
相关题目：