高低水位警报器是用来（），当水位过高或过低时能发出声、光等警_爱下问搜题

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问题填空题

高低水位警报器是用来（），当水位过高或过低时能发出声、光等警报讯号，提前提醒司炉人员采取措施，是一个安全装置。

答案

参考答案：监视锅炉水位

单项选择题

在关系数据库中，对一个关系做投影操作后，新关系的元组个数将（）。

A．只改变这个节的宽度

B．只改变报表的页眉、页脚宽度

C．改变整个报表的宽度

D．因为报表的宽度是确定的，所以不会有任何改变

完形填空

Who is setting your standards for you ?
A true story has it that one elder man 36 to jog around the local high school football field. As he huffed and puffed(气喘吁吁) along, the team was 37 . The players soon started running sprints up and down the field. The man told himself “I will 38 keep running until they quit.”
So he ran. And they ran. And he ran some more. And they kept running. And he kept running until he 39 finally run no more. He stopped in 40 . One of the players, equally out of breath, approached him and said in a crying voice, “Boy, I am so glad that you finally stopped. 41 told us we had to keep running 42 the old guy who was jogging !” He was watching them. They were watching him. He was letting them set his 43 , on the contrary, they allow him to set 44 .
My question is this: Are you keeping 45 with somebody else in your daily life? Are you 46 people to set your standards for you? What about your standards, or 47 , for moral behavior or even your way of building up your own characteristics ? Or guidelines for what kind of life 48 you want? Negative or positive? Do you keep pace with those 49 you, or do you decided yourself just 50 you will live your life? The true is that only you are 51 to determine what your standards will be.
Set your standards too low, and you will know only 52 . But set high standards and you can live an immeasurably full and 53 life. For only when you 54 the best that is within yourself, will you experience great living. Just as an old saying goes: “Think big 55 , and win big success.”
Who is setting your standards?

A．in practice

C．astonishment

B．encouraging

C．uncomfortable

D．unforgettable