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18.
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19.
Directions: In this section you will hear a recorded short passage. The passage is printed in the test paper, but with some words or phrases missing. The passage will be read three times. During the second readings you are required to put the missing words or phrases on the Answer Sheet in order of the numbered blanks according to what you hear. The third reading is for you to check your writing. Now the passage begin.Ladies and gentlemen, good afternoon. First of all, let me 20 to you for coming to the opening ceremony of our new branch office.This branch is the 25th office we have 21 so far. We are very happy that we have finally opened a branch in this city. This branch, we believe, will help 22 the local economy. And our company will in turn benefit from doing business here. We promise that we will provide the 23 to our customers. And, of course, we need your 24 and cooperation.
阀与其它控制方式相比，使用频率较低、动作速度较慢。
气动控制阀是气动系统的 元件，根据用途和工作特点不同，控制阀可以分为三类： 、 和 。
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