问题
单项选择题
气动活塞式执行机构的主要特点是（）。
A.结构简单，动作可靠，维修方便，价格低廉
B.输出力大，适用于大口径、高静压、高压差阀和蝶阀
C.行程长、转矩大
D.结构简单，输出力增大，正反作用变换方便
答案
参考答案：B
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气动活塞式执行机构的主要特点是（）。
A.结构简单，动作可靠，维修方便，价格低廉
B.输出力大，适用于大口径、高静压、高压差阀和蝶阀
C.行程长、转矩大
D.结构简单，输出力增大，正反作用变换方便
参考答案：B
请阅读短文，掌握其大意，然后根据短文内容从下面方框中的七个选项中选出五个还原到短文中，使短文意思通顺、结构完整。（每小题2分） Newspapers are not nearly as popular today as they were in the past. 小题1: Most people read only the sports pages, the advice or the gossip（闲话，绯闻）columns, the comics, and perhaps the classified advertisements. Most people don't take the time to read the real news. 小题2: These techniques（技术，手段）are used on the front page because it is the first thing you see when you pick up the paper. The first page attracts attention and encourages the reader to look through the rest of the paper. 小题3: If the headline is horrible（恐惧的）enough or frightening enough or wild enough, perhaps they will go on to read the front page anymore. They may read the headlines, but that is all, then they turn to the sports page, or comics, or advertisements. It seems that people do not want the news from a newspaper anymore. 小题4: More people watch television news because it is easier and more interesting than reading a newspaper. What about you? Do you read news from a newspaper? 小题5: Or do you care about news at all? Would you mind if there were no news?
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