从热源到热力点(或制冷站)间的管网，称为( )。A．一级管网 B_爱下问搜题

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问题单项选择题

从热源到热力点(或制冷站)间的管网，称为( )。

A．一级管网

B．二级管网

C．三级管网

D．四级管网

答案

参考答案：A

解析：本题的考点是城市供热管网的形制。从热源到热力点(或制冷站)间的管网，称为一级管网；而从热力点(制冷站)至用户间的管网，称为二级管网。一般说来，对于一级管网，往往采用闭式、双管或多管制的蒸汽管网；而对于二级管网，则要根据用户的要求确定。

多项选择题

工程各参建单位填写的工程档案应以( )等为依据。

A．工程项目策划书

B．工程合同

C．设计文件

D．工程质量验收标准

E．竣工及验收规范

完形填空

A boy was walking home from school when he saw a large, tempting （诱人的）apple on one of the branches of an apple tree hanging out over a tall fence. The boy wasn’t much of a fruit-eater, 41 a bar of chocolate if given the choice,     42   , as they say, the forbidden fruit can be tempting. Seeing the apple, the boy wanted it. The more he looked at it, the    43   he felt and the more he wanted that apple.
44  as high as he could , but even at his tallest 45 he was unable to touch it. He began to 46 up and down , as high as he could, at the 47 of each jump stretching his arms to get the apple . Still it remained out of 48 .
Not giving up , he thought , if only he had something to 49 on . His school bag wouldn’t give enough height and he didn’t want to 50  the things inside , like his lunch box , pencil case , and Game boy . Looking  51 , he hoped he might find an old box , a rock , or ,   52 luck , even a ladder , but it was a tidy neighborhood and there was nothing he could use .
He had tried everything he could think to do .   53  seeing any other choices , he gave up and started to walk   54 . At first he felt angry and disappointed thinking about how hungry he had become from his 55 , and how he really wanted that apple . The more he 56 like this , the more unhappy he became.
57   ,the boy of our story was a pretty smart guy, even if he couldn’t always get what get he wanted .He started to say to himself .,This isn’t   58    , I   don’t have the apple and I’m feeling miserable as well. There’s 59  more I can do to get the apple_that is unchangeable-but we are supposed to be able to 60 our feelings. If that’s the case, what can I do to feel better?