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问题 问答题 简答题

活塞式压缩机安全阀的调校方法要求有哪些？

答案

参考答案：

①将安全阀开启压力基本调校在最高工作压力上，负荷试车时由低到高作最后调整

②将安全阀开启，压力调校在该级最低或额定工作压力上，试车时，观察其是否起跳，并进行适当调整（应控制超跳压力不大于该级最高压力），根据阀的调整量与起跳之间的变化关系，凭经验将安全阀调至规定的起跳压力范围，然后卸下安全阀，再用水压进行一次调校

③条件具备的话，安全阀在实验台上调校，是既方便又准确的

填空题

根据句子意思及汉语提示，写出所缺的单词。

Dear Toby,

     It’s a      1_   （好的) Saturday morning.I’m writing a letter to you.I find a new job as an English teacher in Japan. In Japan,the three most popular ways of      2_    ( 到达)to school are bus,train and subways. The students made much noise       3_   ( 直到) the teacher came into the classroom.They have dreams. Some want to be actors or players,others want to be      4_    ( 艺术家).I think Mark is the best student in my class. Young      5_    ( 虽然) he is, he is quiote experienced. He does morning      6_    ( 运动) every day. His mother is one of the     _7_  ( 富有的)woman.What about you? Did you      8_    ( 旅行) the United Kingdom? I can’t hear it clearly.Please speak      9 _   ( 大声).Oh,It’s raining outside. So I have to      10_    ( 带来)umbrella.

                                                                                                                                                  Yours,

                                                                                                                                                  Crystal
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多项选择题

基站与室分设备维护界面的划分，分为（）和（）两类。

A.主设备

B.传输设备

C.非独立信源设备

D.独立信源设备
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