简述受热面管子的清扫方法?

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问题:

简述受热面管子的清扫方法?

考点:锅炉检修工考试锅炉本体检修初级工锅炉本体检修初级工题库
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如图8所示,小球放在光滑的板AO与装有铰链的光滑轻质薄板BO之间,F始终垂直于薄板。当薄板OB由当前位置缓慢转至水平的过程中,下列说法正确的是:

A.F逐渐增大

B.小球对薄板BO的压力先减小后增大

C.小球对木板AO的压力增大

D.薄板BO对小球的弹力不可能小于小球的重力

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采用()是价值价格法区别于其他方法的显著特征。

A平均利润率

B.工资利润率

C.社会利润率

D.综合利润率

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Ali is an antique dealer and one Saturday in November 2007 he put a vase in the window of his shop with a sign which stated ‘exceptional piece of 19th century pottery – on offer for £500’.Ben happened to notice the vase as he walked past the shop and thought he would like to have it. Unfortunately, as he was late for an important meeting, he could not go into the shop to buy it, but as soon as his meeting was finished he wrote to Ali agreeing to buy the vase for the stated price of £500. The letter was posted at 11:30 am.Later on the same day, Chet visited Ali’s shop and said he would like the vase but was only willing to pay £400 for it. Ali replied that he would accept £450 for the vase, but Chet insisted that he was only willing to pay £400 and left the shop. However, on his journey home Chet realised that £450 was actually a very good price for the vase and he immediately wrote to Ali agreeing to buy it for that price. His letter was posted at 12:30 pm.Just before closing time at 5 pm. Di came into Ali’s shop and she also offered £400 for the vase. This time Ali agreed to sell the vase at that price and Di promised to return the following Monday with the money.On the Monday morning Ali received both of the letters from Ben and Chet before Di could arrive to pay and collect the vase.Required:From the point of view of the law of contract advise Ali as to his legal relations with Ben, Chet and Di. (10 marks)

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1mo1氢气在标准状况下的体积为()L。

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莱姆病早期皮肤损害时常选用的药物是()

A.红霉素

B.阿莫西林

C.青霉素

D.头孢曲松

E.阿奇霉素

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