搜题请搜索小程序“爱下问搜题”
问题 单项选择题

关于钢管连接，哪项叙述不正确？（）

A.管径大于800mm时，应采用双面焊。

B.管道对接时，环向焊缝无损检测取样数量与质量要求应按设计要求执行；设计无要求时，压力管道的取样数量应不小于焊缝量的8％。

C.钢管采用螺纹连接时，管节的切口断面应平整，偏差不得超过一扣；丝扣应光洁，不得有毛刺、乱扣、断扣，缺扣总长不得超过丝扣全长的10％；接口紧固后宜露出2~3扣螺纹。

D.管道采用法兰连接时，法兰应与管道保持同心，两法兰间应平行。

答案

参考答案：B

阅读理解

阅读理解。

                                                 Cooking Demonstration (演示) Today at 10 am

                                                        Quick Asian Noodles by Lynn Lee

     See how quickly you can make a delicious noodle meal in your own kitchen. Lynn Lee, a well-known

  cooking instructor and cookbook author, prepares four meals in less than an hour. Two meals will feature

  boiled noodles and two are prepared by stir-frying. These meals are fit for vegetarians, but you can add

  meat or fish if preferred.

     Take advantage of the special offer for people in today's audience: get Lynn's new book for half price.

  Come today and take home Quick Asian Noodles for only $12.49 instead of $24.98.

     Next week's demonstration: Food in Chinese History

     The cook's Bookshop—2nd floor in the Megmall

1. Lynn Lee will cook _____ at 10 am today.

    A. vegetables      

    B. fish  

    C. meat        

    D. noodles

2. Lynn Lee not only teaches how to cook but also _____ .

    A. writes books on cooking  

    B. has a large food shop

    C. studies Chinese history    

    D. sells Asian noodles

3. The program next week is about _____ .

    A. Asian noodles                

    B. food in Chinese history

    C. the cook's bookstore                

    D. Lynn Lee's life

4. It can be seen from the passage that _____ .

    A. Lynn Lee's meals are not for vegetarians

    B. people can get Lynn Lee's new book without paying anything today

    C. Lynn Lee will cook meals in different ways today

    D. the cook's bookstore is on the first floor in the Megmall
查看答案
单项选择题

某商业银行观测到两组客户(每组5人)的违约率为(3%，3%)、(2%，0)、(4%，2%)、(3%，6%)和(8%，3%)，则这两组客户违约率间问的坎德尔系数为()。

A.0.3

B.0.6

C.0.7

D.0.9
查看答案