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【判断题】
专门查询机票信息的检索系统是垂直搜索引擎。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】交流接触器的触头按接触情况可分为(............)、(............)和(............)三种;
【简答题】One day, a man found the cocoon (茧) of a butterfly and he brought it home. A few days later, the man saw a small hole in the cocoon. He sat and watched for several hours as a butterfly struggled to fo...
【简答题】The Touchstone When the great library of Alexandria burned, the story goes, one book was saved. But it was not a valuable book; and so a poor man, who could read a little, bought it for very little mo...
【简答题】交流接触器的触头按接触情况可分为( )、( )和( )三种;按触头的结构形式可分为( )和( )两种;按通断能力可分为( )和( )。
【单选题】Water is much more precious than electricity, for the water for drinking is__________.
A.
disappointed
B.
limited
C.
terrible
D.
various
【简答题】完形填空。 Years ago, a farmer owned some land along the Atlantic coast. He often advertised for assistants, but he got no reply as most people feared the terrible storms across the Atlantic coast. Finally...
【单选题】Dirty water must not be ______ with drinking water.
A.
joined
B.
linked
C.
mixed
D.
combined
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