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阅读理解 阅读下列短文,从每题所给的A 、B 、C 、D四个选项中, 选出能回答所提问题或完成所给句子的最佳选项。 When  English people meet, their first words will be “How do you do?” or“How are you?” After the reply “How do you do?” or “Fine, thank you, and you?” they often talk about the weather. The reason for this is not simply that their weather is interesting and changeable but that the English people don't like talking about personal matters (私事) with people who are not friends. Talking about the weather can be a useful way of starting a conversation with a stranger in public. 1. What are the first words when English people meet? A. Say “hello” to each other. B. Say “goodbye” to each other. C. Talk about the weather D. Talk about their personal matters. 2. What's the answer to “How do you do”? A. Fine, thank you, and you? B. How are you? C. How do you do? D. I'm fine, too. 3. Why do the English people often talk about the weather? A. Because the weather is interesting. B. Because they don't like talking about personal matters with stranger. C. Because the weather is changeable. D. A, B and C are all right. 4. From the article, you know that the English people talk about the weather to ______ A. finish a conversation with a friend. B. start a conversation with a stranger. C. say “goodbye” to a stranger. D. study the weather. 5. Which sentence is not right? A. English people like talking about the weather. B. English people usually talk about personal matters with friends but not strangers. C. English people like talking about personal matters with strangers in public. D. The weather in England is interesting and changeable.
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【单选题】在数据库的如下两个表中,若学生成绩表的主键是学生号和课程名,学生表的主键是学生号。在下列所给的操作中,( )操作不能执行。 学生成绩表 学生表
A.
从学生成绩表中删除行('0001','001',60)
B.
将行('0102','002',80)插入到学生成绩表中
C.
将学生成绩表中学生号=‘0101’的学号改为60
D.
将学生成绩表中学生号=‘0103’的学号改为‘0104’
【单选题】在数据库的如下两个表中,若学生成绩表的主键是学生号和课程名,学生表的主键是学生号。在下列所给的操作中,哪项操作不能执行? 学生成绩表
A.
从学生成绩表中删除行('0001','001',60)
B.
将行('0102','002',80)插入到学生成绩表中
C.
将学生成绩表中的学生号='0101'的成绩改为60
D.
将学生成绩表中学生号='0103'的学号改为'0104'
【判断题】鉴别试验是在药物分析工作中属首项工作,是保证药品安全药效的前提条件。
A.
正确
B.
错误
【判断题】基于社会平均时间成本计算公共自行车效益测算考虑了不同出行方式的使用者的时间成本。
A.
正确
B.
错误
【单选题】如图所示电路中,已知稳压管VD的稳定电压为7V,则回路中的电流
A.
近似为零
B.
为10mA
C.
为5mA
D.
为50m
【单选题】图2 所示电路中,已知稳压管Dz 的稳定电压Uz=5V,流过稳压管的电流Iz 为( )
A.
5mA;
B.
10mA;
C.
20mA;
D.
40mA;
【单选题】有成绩表(学号,课程号,成绩),查询成绩为空值的学生学号和课程号的SQL语句是:( )
A.
select 学号 , 课程号 from 成绩表 where 成绩=0
B.
select * from 成绩表 where 成绩=’’
C.
select 学号 , 课程号 from 成绩表 where 成绩=NULL
D.
select 学号 , 课程号 from 成绩表 where 成绩  IS  NULL
【单选题】图 所示电路中,已知稳压管 Dz 的稳定电压 Uz = 5V ,流过稳压管的电流 Iz 为( )。
A.
5mA
B.
10mA
C.
20mA
D.
40mA
【单选题】在右图所示电路中,已知稳压管 D Z 的稳定电压 U Z = 5V ,流过稳压管的电流 I Z 为( )
A.
5mA
B.
10 mA
C.
20 mA
D.
40 mA
【单选题】在图所示电路中,已知稳压管 D Z 的稳定电压 U Z = 5V ,流过稳压管的电流 I Z 为( ) 。
A.
5mA
B.
10 mA
C.
20 mA
D.
40 mA
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