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问题 单项选择题

电气号灯的垂直光弧，除在航帆船外，应在水平上方5度到水平下方5度内达到最低的发光强度；从水平上方7.5度到水平下方7.5度应保持最低发光强度的（）%。

A.50

B.60

C.40

D.70

答案

参考答案：B

改错题

My wife and I went to a supermarket, there we bought some cold drinks and cakes. After we came out of the supermarket, we noticed that in the front of the supermarket was a nice little garden with benches for people relax on. We sat there and started enjoying the things we have just bought. There was ten small cakes in the bag and we couldn’t eat all of it. I wanted to share, but of whom? A young boy appeared. He was looking into the trashcan for nothing to eat. We had just finished three of the ten cakes. So, I took the remained pieces and gave them to him. He thanked me and ran away in a happily mood.
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单项选择题

应用数据库的主要目的是( )。

A．解决数据保密问题
B．解决数据完整性问题
C．解决数据共享问题
D．解决数据量大的问题
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