下列哪个说法不是均匀加宽的性质（）？A、每个发光原子只对谱_爱下问搜题

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问题单项选择题

下列哪个说法不是均匀加宽的性质（）？

A、每个发光原子只对谱线内与它的表观中心频率相应部分有贡献

B、每一个发光原子对光谱线内任一频率都有贡献

C、温度越高，振动越激烈，谱线越宽

答案

参考答案：A

完形填空

完形填空。

     I'm Jack. I'm   1   American boy. I'm twelve. I'm a student   2   a school. I'm in Class 7, Grade 6.
Tom is my good friend. We are in the   3   class. He is twelve, too. It's a picture of   4    family here.
   5   look at it. The man behind the chair is his father. The woman in a red hat is his mother. She is a
teacher. Tom has    6   sisters. Their names   7   Lucy and Lily. They have a cat.   8     name is Huahua.
Now it's   9    the floor under the desk.  10   twin sisters are students, too. They are in the same class.

( )1. A. a
( )2. A. of
( )3. A. some
( )4. A. he's
( )5. A. It's
( )6. A. one
( )7. A. am
( )8. A. It
( )9. A. near
( )10. A. The

B. an
B. for
B. one
B. he
B. It
B. tow
B. is
B. It's
B. on
B. This

C. /
C. on
C. same
C. him
C. Let
C. three
C. are
C. Its'
C. in
C. Tow

D. the
D. to
D. different
D. different
D. Let's
D. four
D. be
D. Its
D. to
D. A

单项选择题

根据合同法规定，订立合同要经过( )两个阶段。

A．要约邀请和要约

B．要约和承诺

C．要约邀请和承诺

D．通知承诺和签订确认书