下面关于截面的形心主惯性轴y、z的定义,只有( )是正确的。A.(A) Sy=Sz=

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问题:

下面关于截面的形心主惯性轴y、z的定义,只有( )是正确的。

A.(A) Sy=Sz=0

B.(B) Iyz=0

C.(C) Iy=Iz=0

D.(D) Sy=Sz=0,Iyz=0

考点:勘察设计行业考试基础知识
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CV穿刺后突然发绀,有脉压低、奇脉、心音遥远()

A.气胸 

B.心包压塞 

C.血胸 

D.空气栓塞 

E.血肿

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春秋时期,批评郑国和晋国公布成文法的是()。

A.孔丘

B.商鞍

C.魏文侯

D.叔向

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“ I’d like to be at a healthier weight , ” a friend told me . “ But we just don’t have the money to buy expensive diet foods and there isn’t enough money to join a gym .” Many people feel that way—that a healthy diet and exercise plan is out of reach because of their high cost . Don’t lose hope ! We’ll be looking at ways to make healthy choices without spending too much money .

First you don’t need to buy the expensive pre-prepared “ diet foods . ” Back in the early 1970s when I started housekeeping , 90% of the food I bought was ingredients . Very few things were preprocessed(预处理的). Now 90% of the food you find in the store is quick food . That’s a bad thing .

Quick foods like boxed “ just add hamburger ” meals have had the fiber removed to make them faster to prepare . Take a look at the label on that box . It often has low numbers listed under “ fiber ” because fiber takes longer to digest . If the low fiber meal is digested , the result is that your body begins to store fat . Besides , your body is short of nutrients(营养物质). You will be driven to eat more to try to make up for the low quality of the food you are eating .

And then there are the chemicals the producers add to the quick meals to make them palatable . If not , the stuff would taste like cardboard and you wouldn’t enjoy it . However , these chemicals certainly aren’t good for your health .

What’s the answer ? Buy whole ingredients and give up the expensive , low nutrition , processed foods . Do the cooking yourself and you will have control over what is in your food —and it will cost less , too .

小题1:People who find it hard to get a healthier weight think        .

A.they had too much diet foods

B.they didn’t make a detailed plan

C.they have no time to do exercise in gym

D.they can’t afford diet foods and to exercise in gym小题2: The author doesn’t like quick food mainly because       .

A.it contains too much fat

B.it makes people eat less

C.it has low fiber

D.it takes longer to digest小题3:The underlined word “ palatable ” in Paragraph 4 probably means “       ”.

A.fresh

B.delicious

C.healthy

D.simple小题4:The author suggests in the text that people should       .

A.control the amount of food

B.eat more processed foods

C.cook food for themselves

D.choose cheap ingredients小题5:Which of the following best shows the structure of the passage ? (①="Paragraph" 1,

②="Paragraph" 2 ,…⑤="Paragraph" 5)

A.①/②③④/⑤

B.①②/③④/⑤

C.①②③/④/⑤

D.①/②③/④⑤

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在一个统计总体中,包含反映总体单位特征的标志,都是可变标志,没有不变标志。( )

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稠油地面掺水的操作要点是开井前水循环,生产中水稳定,()

A、关井前再循环

B、关井后再循环

C、关井前再冲洗

D、关井后再冲洗

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