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【单选题】
Read the two pieces of writing below, and follow the instructions. Movies There are three reasons why I love movies. First of all, movies take us all over the world. We can see beautiful sights and learn about interesting cultures without ever leaving home. Second, movies show us how other people live and solve their problems. This helps us make decisions about our own problems. Finally, and maybe most important, movies are just plain fun. After a hard day at work, it feels good to sit down and be entertained by a good movie. Television My family has three television sets. Some channels are in languages other than English, so I can’t watch them. I like TV because there are so many different shows, but I don’t like to watch television with my brother because he changes the channels all the time. Some people like comedies because they help us forget a hard day at work. As for me, I like news and music shows the best. Some shows are very funny, and some teach us about foreign countries and cultures. Which piece of writing is easier to understand because it’s better organized? Circle one.
A.
Movies
B.
Television
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举一反三
【单选题】–1028 采用 IEEE 754 单精度浮点数格式表示的结果(十六进制形式)是( )。
A.
C4C04000H
B.
44C04000H
C.
C4808000H
D.
44808000H
【单选题】直径为10mm的45钢棒,加热至850℃投入水中,其显微组织应为( )。
A.
M
B.
M+α
C.
M+Ar
D.
M+P
【单选题】经退火后的直径为10 mm的亚共析钢45钢钢棒,加热到500°C投入水中,其显微组织应为( )。
A.
马氏体
B.
铁素体+马氏体
C.
铁素体+珠光体
D.
马氏体+珠光体
【单选题】直径为10mm的45钢棒,加热到850°C投入水中,其显微组织应为( )。
A.
马氏体
B.
铁素体+马氏体
C.
马氏体+残余奥氏体
D.
马氏体+珠光体
【单选题】直径为10mm的45钢棒,加热至850℃投入水中,其显微组织应为(    )。
A.
M    
B.
M+d    
C.
M+Ar    
D.
M+P
【单选题】直径为10mm的45钢钢棒,加热到850°C投入水中,其显微组织应为( )。
A.
马氏体
B.
铁素体+马氏体
C.
马氏体+残余奥氏体
D.
马氏体+珠光体
【单选题】直径为10 mm的45钢钢棒,加热到Ac3温度以上20-30°C,然后投入水中,其显微组织应为( )。
A.
马氏体
B.
铁素体+马氏体
C.
马氏体+残余奥氏体
D.
马氏体+珠光体
【简答题】试说明贯穿裂缝的形成原因与危害。
【单选题】直径为 10mm 的 45 钢钢棒,加热到 850 °C 水淬,其显微组织应为:
A.
M
B.
M+F
C.
M+A'
D.
M+P
【简答题】试说明贯穿裂缝的形成原因与危害。
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