碳钢中基本金相体有（）。A.奥氏体、马氏体、铁素体、渗碳体 B._爱下问搜题

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问题单项选择题

碳钢中基本金相体有（）。

A.奥氏体、马氏体、铁素体、渗碳体

B.珠光体、贝氏体

C.索氏体、屈氏体

D.珠光体、屈氏体

答案

参考答案：A

完形填空

Han Mei is a nice girl. She 1 from Yunnan. 2 this picture of her family. There are 3 people in her family. 4 can see her father, her mother and her brother. Han Mei is behind (在后面) her mother, 5
we can see her. Han Mei has a 6 . It's a nice cat. Its 7 i

s Mimi. Can you see 8 cat? Oh, 9 in
Han Mei's arms. Han Mei has a 10 25 family. She loves her family very much .

( )1. A. comes
( )2. A. Look
( )3. A. three
( )4. A. We
( )5. A. but
( )6. A. dog
( )7. A. age
( )8. A. a
( )9. A. it's
( )10. A. small

B. come
B. Look at
B. four
B. They
B. and
B. bird
B. name
B. an
B. he's
B. big

C. are
C. See
C. five
C. She
C. or
C. pet
C. friend
C. the
C. she's
C. happy

单项选择题

水电厂厂用电系统电器设备选择时，用( )以下熔断器保护的电器可不校验动热稳定。

A．60A；
B．63A；
C．80A；
D．100A。