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题目:用与非门构成异或门。 要求:按设计电路连接实现与非门构成异或门的功能。 ( 1 )输入变量 A 、 B 由逻辑电平开关提供,输出变量 F 由逻辑电平指示的发光二极管指示。改变输入变量状态,记录下列各情况下输出变量的状态。 A=0 , B=0 , F= ( );
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举一反三
【单选题】牙颌可重复的基本的，相对稳定的颌位有
A.
牙尖交错位、下颌后退接触位
B.
前伸牙合、侧位
C.
下颌姿势位
D.
牙尖交错位、后退接触、下颌姿势位
E.
前伸牙合、侧牙合位、下颌姿势位
查看完整题目与答案
【判断题】能进行硝酸盐呼吸的都是专性厌氧微生物。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Section B Dialogue Comprehension Directions: In this section, you will read 5 short conversations between a man and a woman. At the end of each conversation there is a question followed by four choice...
A.
At office.
B.
On the highway.
C.
At a manager's conference.
D.
In a supermarket.
查看完整题目与答案
【判断题】凡能进行硝酸盐呼吸的细菌,都是反硝化细菌,都存在着一条完整的呼吸链。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Section A Directions: In this section, you will read 5 short incomplete dialogues between two speakers, each followed by 4 choices marked A, B, C, and D. Choose the answer that best suits the situatio...
A.
how can I do it?
B.
that's alright．
C.
I have my hands full．
D.
that's impossible．
查看完整题目与答案
【单选题】Section B Directions: In this section, you will read 5 short conversations between a man and a woman. At the end of each conversation there is a question followed by 4 choices marked A, B, C and D. Ch...
A.
He felt sorry for being late.
B.
He did not admit he was late.
C.
He got nervous for being late.
D.
He did not care about being late.
查看完整题目与答案
【单选题】牙颌可重复的基本的，相对稳定的颌位有
A.
牙尖交错位、下颌后退接触位
B.
前伸合、侧位
C.
下颌姿势位
D.
牙尖交错位、后退接触、下颌姿势位
E.
前伸合、侧合位、下颌姿势位
查看完整题目与答案
【单选题】能进行硝酸盐呼吸的都是( )。
A.
好氧菌
B.
微好氧菌
C.
兼性厌氧菌
D.
厌氧菌
查看完整题目与答案
【单选题】能进行硝酸盐呼吸的细菌都是（ ）。
A.
专性好氧菌
B.
兼性厌氧菌
C.
专性厌氧菌
D.
耐氧菌
查看完整题目与答案
【单选题】Section B Dialogue Comprehension Directions: In this section, you will read 5 short conversations between a man and a woman. At the end of each conversation there is a question followed by four choice...
A.
Most students would like to work for a newspaper.
B.
Most students find a job by reading advertisements.
C.
Most students find it hard to get a job by reading advertisements.
D.
Most students don't want jobs advertised in the newspapers.
查看完整题目与答案
相关题目：
【单选题】牙颌可重复的基本的，相对稳定的颌位有
A.
牙尖交错位、下颌后退接触位
B.
前伸牙合、侧位
C.
下颌姿势位
D.
牙尖交错位、后退接触、下颌姿势位
E.
前伸牙合、侧牙合位、下颌姿势位
查看完整题目与答案
【判断题】能进行硝酸盐呼吸的都是专性厌氧微生物。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Section B Dialogue Comprehension Directions: In this section, you will read 5 short conversations between a man and a woman. At the end of each conversation there is a question followed by four choice...
A.
At office.
B.
On the highway.
C.
At a manager's conference.
D.
In a supermarket.
查看完整题目与答案
【判断题】凡能进行硝酸盐呼吸的细菌,都是反硝化细菌,都存在着一条完整的呼吸链。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Section A Directions: In this section, you will read 5 short incomplete dialogues between two speakers, each followed by 4 choices marked A, B, C, and D. Choose the answer that best suits the situatio...
A.
how can I do it?
B.
that's alright．
C.
I have my hands full．
D.
that's impossible．
查看完整题目与答案
【单选题】Section B Directions: In this section, you will read 5 short conversations between a man and a woman. At the end of each conversation there is a question followed by 4 choices marked A, B, C and D. Ch...
A.
He felt sorry for being late.
B.
He did not admit he was late.
C.
He got nervous for being late.
D.
He did not care about being late.
查看完整题目与答案
【单选题】牙颌可重复的基本的，相对稳定的颌位有
A.
牙尖交错位、下颌后退接触位
B.
前伸合、侧位
C.
下颌姿势位
D.
牙尖交错位、后退接触、下颌姿势位
E.
前伸合、侧合位、下颌姿势位
查看完整题目与答案
【单选题】能进行硝酸盐呼吸的都是( )。
A.
好氧菌
B.
微好氧菌
C.
兼性厌氧菌
D.
厌氧菌
查看完整题目与答案
【单选题】能进行硝酸盐呼吸的细菌都是（ ）。
A.
专性好氧菌
B.
兼性厌氧菌
C.
专性厌氧菌
D.
耐氧菌
查看完整题目与答案
【单选题】Section B Dialogue Comprehension Directions: In this section, you will read 5 short conversations between a man and a woman. At the end of each conversation there is a question followed by four choice...
A.
Most students would like to work for a newspaper.
B.
Most students find a job by reading advertisements.
C.
Most students find it hard to get a job by reading advertisements.
D.
Most students don't want jobs advertised in the newspapers.
查看完整题目与答案