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当上下两节井壁的法兰盘接缝进入泥浆面（）米深时，门式起重机应停止钩头的下放工作，安排专人对焊接处检查，无漏水现象后方可继续下沉。

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Part 1


Question 46-50


·Here is an advertisement about a Business Book Club.
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☆ Read the advertisement and complete the given information form.
Write a word, phrase or number in the spaces 1-5.

Business Book Club


Type of book: (1) ______
Type of reader: (2) ______
Writers: (3) ______
They need: (4) details of your ______
Contact Number: (5) ______
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单项选择题 A1型题

CT扫描中，边缘增强滤过的作用是

A．增强所显示图像组织结构的边缘 

B．只增强组织中血管的边缘 

C．只增强病灶的边缘 

D．只增强高密度组织结构的边缘 

E．低密度的组织结构都被去除
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