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【多选题】
动火作业分为( )三类。A.
特殊危险动火作业
B.
一级动火作业
C.
二级动火作业
D.
三级动火作业
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反馈参考答案：
举一反三
【单选题】节流式流量计是根据（）来测量流量的。
A.
流体流经节流装置时产生的压力差
B.
压降不变，节流面积的变化
C.
流体流经节流装置时产生的速度变化
D.
流体流经节流装置时产生的机械能损失
【单选题】哪个句子中的she是弱读？
A.
She doesn ’ t smoke or drink.
B.
She is my sister.
C.
Ah, that ’ s what she told you!
D.
She is my teacher.
【简答题】My father was Chief engineer of a merchant ship, which was sunk in World War II. The book Night of the U-boats told the story. Memories In September, 1940, my mother, sister and I went to Swansea, whe...
【简答题】完形填空。 April 14th is my grandmother's birthday. I'll go back to my hometown 1 my parents. Yesterday, after supper our family had a 2 . 'What 3 we buy for grandmother next week?' I asked. 'We can buy he...
【简答题】My earliest childhood memory was about kindergarten (幼儿园). My father was a doctor, my mother was a teacher. __60__. They had no time to look after my younger sister and me. When I was five years old, ...
【单选题】下面关于差压式流量计的系数检定法，错误的是：（）
A.
它一般是在流量标准装置上对流出系数进行检定
B.
作为计量传递标准的节流装置用此检定法
C.
进行质量性能试验的节流装置不用此检定法
D.
规程之外的节流装置不用此检定法
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