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一般吊装作业中怎样选择吊装点?

答案

参考答案:

一般吊装作业不需准确计算物体重心位置,而是估计物体的重心位置,然后用低位试吊的方法来逐步找到重心位置,确定吊点的绑扎位置。

阅读理解

                             Table Manners in America   

          Don’t circle your plate with your arms. If you do so, you will

become the focus(焦点) of the table. Everyone would wonder,"Is

there anything wrong with the food?" This may give a wrong message

that you don't like the food or something like that. 

     Don't push the plate back when finished. Leave it where it was.

Do you want to let the hostess(女主人) know that you've just

done a labour?

     Don't lean(倚靠)  back and say"I'm through"or"I'm full". Just

put the fork and knife across the plate. That's all. 

     Don't cut up everything before you start to eat. Cut only one

or two bites(块) at a time. 

     Never take a huge mouthful of anything. Do you want to show

how hungry you are? Don't do that. It's not so good.    

     It's never good   to reach across the table for anything. If the

thing you want is not at hand, simply ask the nearest person for

help, like “Mrs Smith, could you pass me the dish?”

1. If you are at table and circle your plate with your arms,

other people will think              .

         A. you don't like the food

         B. the food isn't good for you

         C. there is something wrong with the food

         D. all the above

2. After finishing dinner, you should            .  

         A. put the fork and knife across the plate

         B. stand up and leave the table

         C. say “I'm full”

         D. say “Thank you”

3. If you want a dish far from you at table, you should           .

         A. stand up and reach across the table for it

         B. leave your seat to get it 

         C. sit there until others help you

         D. ask the nearest person for help

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