问题
单项选择题
在柴油机运转时对冷却系统的管理中错误的是（）。
A．调节淡水泵出口阀开度控制水量
B．调节淡水泵进口阀开度控制水量
C．控制海水出口温度不应超过45～50℃
D．控制海水进口温度不低于25℃
答案
参考答案：B
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在柴油机运转时对冷却系统的管理中错误的是（）。
A．调节淡水泵出口阀开度控制水量
B．调节淡水泵进口阀开度控制水量
C．控制海水出口温度不应超过45～50℃
D．控制海水进口温度不低于25℃
参考答案：B
阅读短文，从下列各题所给的A、B、C、D四个选项中选出一个最佳答案。 Life will be because many changes will take place in 30 years, but what will the changes be? The population is growing fast. There will be people in the world and most of them will live longer than before. Computers will be smaller and more useful, and there will be at least one in every home. Computer science will be one of the most important in school. People will work fewer hours than they are doing now, so they will have more free time for sports, watching TV and traveling. Traveling will be much cheaper and . Many more people will go to other countries holidays. There will be changes in our food, too. More land will be used for new towns and houses. Then there will be less for cows and sheep, so meat will be more expensive. Maybe people won’t eat it every day; they will eat more vegetables and fruit instead. Maybe people will be healthier. Work in the future will be different, too. Dangerous and hard work will by robots. Because of this, many people will not have to do. This will be a problem.
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