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问题 多项选择题

以下关于煤粉细度的表述正确的是（）。

A、锅炉煤粉细度可以在不用做试验的情况下任意调整

B、对于燃用烟煤的锅炉，煤粉细度R90最小值应控制不低于3%

C、对于燃用烟煤的锅炉，煤粉细度R90最小值应控制不低于4%

D、对于燃用烟煤的锅炉，煤粉细度R90最小值应控制不低于5%

答案

参考答案：A, C

完形填空

Water costs money．In some places water is hard  31 ．What 32 when a town has these problems？A small town in California found a happy 33 ．

Very 34 rain ever fell there．The town had no water35 ．The water it used was 36  from a river 300 miles away．As more people  37  live in the town  38  water was needed．Now water  39  to be brought in from 600 miles away．All these cost  40 money．

The town 41 a plan．It found 42   to clean its “dirty” water．Once the cleaned water was reused  43  many ways．Five  44  lakes were built．Here people could swim and fish and go  45 ．They  46  have picnics in their new parks．Farmers had more water 47  their crops．New factories can be built，now that they have the promise of  48 ．

In most places，water is used and thrown 49．The town that saved 50 water has saved the town！

小题1:    

A．supplying

B．getting

C．to get

D．to supply小题2:    A．happens     B．happening    C is happened     D．happened

小题3:    A．key         B．answer       C answering    D．way

小题4:    

A．little

B．a little

C．few

D．a few小题5:    A．of itself   B．of its own  C．for its own    D for itself

小题6:    

A．fetch

B．take

C．brought in

D．guided小题7:    

A．come to

B．came to

C．coming to

D．came for小题8:    

A．many

B．plenty of

C．more

D．many more小题9:    

A．has

B．had

C．must

D．needed小题10:  

A．many

B．a few

C．a great many

D．a lot of小题11:  

A．put

B．made

C．supply

D．noticed小题12:  

A．a way

B．ways

C．an answer

D．a key小题13:  

A．for

B．by

C．at

D．in小题14:  

A．man-making

B．man-make

C．man-made

D．man made小题15:  

A．boating

B．to boat

C．to boating

D．on boating小题16:  

A．must

B．could

C．needed

D．had to小题17:  

A．as

B．with

C．for

D．to小题18:  

A．water enough

B．enough water

C．crops enough

D．enough crops小题19:  

A．off

B．of

C．away

D．out of小题20:  

A．it’s

B．its

C．one’s

D．his
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问答题 简答题

描述西北内流河的水系和水文特征（以塔里木河、伊犁河、弱水为例）
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