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高层民用建筑防烟楼梯间前室、消防电梯前室自然排烟时，可开启外窗面积不应小于( )㎡。

A.2
B.3
C.4
D.5
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单项选择题
Ron was an engineer.He planned a change and tried the new job of teaching kids how to swim.Ron′s easy?manner soon made him a full-time employee at the swim school.
Now,the 40 hours he works a week takes in weekends,early mornings and late afternoons.He earns around?25%less than he did in engineering.But,at 49,he says he has never been happier."I′ve had a drop in pay,but I′ve?cut back on spending,too.I seldom drive to work so don′t have to pay as much for petrol（汽油）.I don′t drink as much.I go walking in my lunch break and I′ve lost 20 kilos.I love going to work.The whole family is a lot happier."
When one of his brothers called,offering to help him find"a real i oh",he answered,"I don′t care.I know what?I′m doing is good."
He admits it was fearful making such a big change when there was the mortgage（分期付款）to pay and kids to clothe and feed,but in the end he feels it is a simple choice."If you′re in a job you don′t like,get out.Money′s not?everything.If you don′t like it,change—find something you′re going to be happy with."
How does Ron manage to cut back on spending?
A.Hespendslessonclothes
B.Hecallshisbrothersless
C.Hedrivesless
D.Hehaslessfoodforlunch
单项选择题
完成生活史需要两种及以上脊椎动物宿主的原虫是
A．间日疟原虫
B．刚地弓形虫
C．蓝氏贾第鞭毛虫
D．溶组织内阿米巴
单项选择题
Ron was an engineer.He planned a change and tried the new job of teaching kids how to swim.Ron′s easy?manner soon made him a full-time employee at the swim school.
Now,the 40 hours he works a week takes in weekends,early mornings and late afternoons.He earns around?25%less than he did in engineering.But,at 49,he says he has never been happier."I′ve had a drop in pay,but I′ve?cut back on spending,too.I seldom drive to work so don′t have to pay as much for petrol（汽油）.I don′t drink as much.I go walking in my lunch break and I′ve lost 20 kilos.I love going to work.The whole family is a lot happier."
When one of his brothers called,offering to help him find"a real i oh",he answered,"I don′t care.I know what?I′m doing is good."
He admits it was fearful making such a big change when there was the mortgage（分期付款）to pay and kids to clothe and feed,but in the end he feels it is a simple choice."If you′re in a job you don′t like,get out.Money′s not?everything.If you don′t like it,change—find something you′re going to be happy with."
What is Ron′s new job like?
A.Well-paid
B.Interesting
C.Easytodo
D.Nofreetime
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