具有自然通风的单层建筑物，所散发的可燃气体密度小于室内空气密_爱下问搜题

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问题单项选择题

具有自然通风的单层建筑物，所散发的可燃气体密度小于室内空气密度时，宜设置事故( )。

A．排风系统
B．送风系统
C．净化系统
D．防爆系统

答案

参考答案：B

完形填空

A little boy almost thought of himself as the most unfortunate child in the world because a disease made his leg lame. He ____ played with his classmates. When the teacher asked him to answer questions, he always ____ his head without a word.
One ____ the boy's father asked for some saplings (树苗) from the neighbor. He wanted the ____ to plant a sapling each person in front of the house. The father said, “Whose sapling grows best, I will buy him or her a favorite ____.” Seeing his brothers and sisters watering the trees, however, the boy had an idea. He hoped that the tree he planted would ____ soon. So, after watering it once or twice，he never ____ it.
A few days later, when the little boy went to see his tree again, he was ____ to find that it didn't wilt (枯萎) but grew some fresh leaves. ____ the trees of his brothers and sisters, his tree was even greener. His father kept his ____， bought the little boy his favorite gift and said that from the tree he planted, he would become an outstanding ____ when he grew up.
Since then, the little boy slowly became ____. One night, he lay on the bed but could not sleep. Then he got up and came to the ____. To his surprise, his ____ was splashing something onto his tree.____， he understood—his father had been ____ fertilizing his small tree!
He returned to his room，____ running down.
____ passed. The little boy didn't become a botanist, but he was elected President of the United States. His name was Franklin Roosevelt.
Love is the ____ nourishment (营养) of life. ____ it is just a drop of clear water, it can still help the tree of life thrive (茁壮成长)．

B．attended to

C．belonged to

D．objected to

A．Compared with

C．Connected to

D．Popular with

A．All of a sudden

B．For a moment

D．From then on

单项选择题

中长期来水的流量定量预报中，以多年变幅的（）作为许可误差。

A.0.05

B.0.1

C.0.15

D.0.2