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电子气泡式水平仪结构简图如图2-33所示,密封的玻璃内充入导电液体,中间保留一个小气泡。玻璃管两端各引出一根不锈钢电极。在玻璃管中间对称位置的下方引出一个不锈钢公共电极。请分析该水平仪的工作原理之后填空。 图2-33 气泡式电子水平仪结构简图 1-被测平面 2-导电水柱 3-气泡 4-密封玻璃管 5-不锈钢电极 6-公共电极 7-外壳 1)当被测平面完全水平时,气泡应处于玻璃管的中位置,左右两侧的不锈钢电极与公共电极之间的电阻R1、R2的阻值相同。如果希望此时电桥的输出电压Uo=0,则R1、R2、R3、R4应满足______的条件。2)如果实际使用中,发现仍有微小的输出电压,则应调节______,使Uo趋向于零。3)当被测平面向左倾斜(左低右高)时,气泡漂向右边,R1变______,R2变______,电桥失去平衡,Uo增大。
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【简答题】两个碳质量分数为1.2%的碳钢薄试样,分别加热到780°C和900°C,保同时间奥氏体化后,以大于临界冷却速度的速度冷却至室温。试分析: (1)哪个温度加热淬火后马氏体晶粒粗大? (2)哪个温度加热淬火后马氏体中碳质量分数较少? (3)哪个温度加热淬火后残余奥氏体量较多? (4)哪个温度加热淬火后未溶碳化物量较多? (5)你认为哪个温度加热淬火合适?
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【单选题】Exercise 2 Directions: You will hear a talk which introduces job interview skills. Please choose the best answer to each question. Part 1 6. Which of the following is not a bad answer listed in the le...
A.
I have great communication skills .
B.
I have great proposal writing skills.
C.
I have great negotiating skills.
D.
I wish to get a high pay.
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【简答题】根据所给首字母完成下面的短文。 I'd l 1 to tell you about Halloween. People in the USA celebrate it in the evening o 2 October 31st.On that day, children like to play a c 3 'trick or treat'. They knock on p 4 do...
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【单选题】Section B Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and que...
A.
$2,00.
B.
$3.00.
C.
$4.00.
D.
$1.00.
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【单选题】由于工程项目的规模不同,采用的评审方法也不同,评审方法可以分为()。
A.
专家评议法和综合评估法
B.
综合评估法和评标价法
C.
定性评审法和定量评审法
D.
专家评议法和评标价法
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【单选题】In a state in the USA, you _______ make ugly faces at a dog, or you can be arrested for doing so.
A.
have to
B.
don't have to
C.
must
D.
mustn't
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【判断题】“另起炉灶”就是指新中国的建立必须清理旧中国残留的对外关系的遗迹。
A.
正确
B.
错误
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【简答题】Reading comprehension. When we walk through the city, we all experience a kind of information overload but we pay attention only to those that are important to us. We don't stop, we keep our faces exp...
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【单选题】In a state in the USA, you _______ make ugly faces at a dog, or you can be arrested for doing so.
A.
have to
B.
must
C.
don't have to
D.
mustn't
查看完整题目与答案
【单选题】Compele the sentences.完成下列句子。 In a state in the USA, you make ugly faces at a dog, or you can be arrested for doing so.
A.
have to
B.
don't have to
C.
mustn't
查看完整题目与答案
相关题目：
【简答题】两个碳质量分数为1.2%的碳钢薄试样,分别加热到780°C和900°C,保同时间奥氏体化后,以大于临界冷却速度的速度冷却至室温。试分析: (1)哪个温度加热淬火后马氏体晶粒粗大? (2)哪个温度加热淬火后马氏体中碳质量分数较少? (3)哪个温度加热淬火后残余奥氏体量较多? (4)哪个温度加热淬火后未溶碳化物量较多? (5)你认为哪个温度加热淬火合适?
查看完整题目与答案
【单选题】Exercise 2 Directions: You will hear a talk which introduces job interview skills. Please choose the best answer to each question. Part 1 6. Which of the following is not a bad answer listed in the le...
A.
I have great communication skills .
B.
I have great proposal writing skills.
C.
I have great negotiating skills.
D.
I wish to get a high pay.
查看完整题目与答案
【简答题】根据所给首字母完成下面的短文。 I'd l 1 to tell you about Halloween. People in the USA celebrate it in the evening o 2 October 31st.On that day, children like to play a c 3 'trick or treat'. They knock on p 4 do...
查看完整题目与答案
【单选题】Section B Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and que...
A.
$2,00.
B.
$3.00.
C.
$4.00.
D.
$1.00.
查看完整题目与答案
【单选题】由于工程项目的规模不同,采用的评审方法也不同,评审方法可以分为()。
A.
专家评议法和综合评估法
B.
综合评估法和评标价法
C.
定性评审法和定量评审法
D.
专家评议法和评标价法
查看完整题目与答案
【单选题】In a state in the USA, you _______ make ugly faces at a dog, or you can be arrested for doing so.
A.
have to
B.
don't have to
C.
must
D.
mustn't
查看完整题目与答案
【判断题】“另起炉灶”就是指新中国的建立必须清理旧中国残留的对外关系的遗迹。
A.
正确
B.
错误
查看完整题目与答案
【简答题】Reading comprehension. When we walk through the city, we all experience a kind of information overload but we pay attention only to those that are important to us. We don't stop, we keep our faces exp...
查看完整题目与答案
【单选题】In a state in the USA, you _______ make ugly faces at a dog, or you can be arrested for doing so.
A.
have to
B.
must
C.
don't have to
D.
mustn't
查看完整题目与答案
【单选题】Compele the sentences.完成下列句子。 In a state in the USA, you make ugly faces at a dog, or you can be arrested for doing so.
A.
have to
B.
don't have to
C.
mustn't
查看完整题目与答案
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