试题与答案

某流量调节系统,调节阀是对数特性。在满负荷生产时,测量曲线平直;改为半负荷生产时,曲

题型:问答题 论述题

题目:

某流量调节系统,调节阀是对数特性。在满负荷生产时,测量曲线平直;改为半负荷生产时,曲线漂浮,不容易回到给定值。是何原因?怎样才能使曲线在给定值上稳定下来?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析:洞宽bh<0.3×l0=0.3×6.05=1.815(m);hh<hw-0.4=2.85-0.4=2.45(m)

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Do you want to live a happier, less stressful life? Try laughing for no reason at all. That’s how thousands of people start their day at Laughter Clubs around the world.

The first Laughter Club was started in Mumbai, India, in 1995, by Dr Madan Kataria. “Children laugh about 300 times a day. Adults laugh between 7 and 15 times a day,” says Dr Kataria. “Everyone’s naturally good at laughing — it’s the universal (共同的) language.” There are now more than 500 Laughter Clubs in India and over 1,300 worldwide.

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So what happens at a Laughter Club? I went along to the nearest club in the south of London to find out. I was quite nervous at the beginning of the class. I had no interest in laughing with a group of strangers, and I was worried about looking stupid (愚蠢的). Our laughter teacher told us to clap our hands (拍手) and say “ho ho ho, ha ha ha” while looking at each other. Although we couldn’t tell the differences between fake laughter and real laughter, they still produced the same healthy effects.

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