(单选题)4: 只有触发事故时才会引起损伤、火灾或爆炸的潜在危险称为（ ）危险。 A: 一级 B: 二级 ...

(单选题)18: 数据操纵语言DML根据其实现方法可以分为( )和( )两大类。 A: 自含型语言、宿主型语言 B: 自主型语言、高级语言 C: 高级语言、宿主型语言 D: 高级语言、低级语言 ...

(单选题)12: 只清空当前表HGZ.DBF中奖金字段的全部值,应当使用命令( ) A: MODIFY　STRUCTURE B: DELETE C: REPLAC D: ZAP ...

(单选题)6: 下面有关HAVING子句描述错误的是( ) A: HAVING子句必须与GROUP BY子句同时使用，不能单独使用 B: 使用HAVING子句的同时不能使用WHERE子句 C: 使用HAVING子句的同时可以使用WHERE子句 D: 使用HAVING子句的作用是限定分组的条件 ...

(单选题)20:  —Good morning, may I speak to Mark, please?  —__________ A: Who’s there? B: Who’s that speaking? C: Who are you? D: Who wants to speak to Mark? ...

(单选题)14:  A: Must we finish the work right now?B: No, you _______. You can do it tomorrow. A: needn't B: shouldn't C: mustn't D: can't ...

(单选题)8:  —You seem to be lost. Need help?  —_________   A: Yes, would you please help me with the bag? B: Help me find my key, please. C: Yes, with pleasure. D: I'm looking for Zhongshan Road. ...

(单选题)10:  On average, a successful lawyer has to talk to several ______ a day. A: customers B: supporters C:  guests D: clients ...

(单选题)4:  —How are you getting on today?   —__________   A: Very well B: How do you do? C: I’m a doctor. D: Nice to have known you. ...

(单选题)18: We’ve ____paper and ink. Ask Mr. Howard to lend us some. A: run away with B: run out of C: run off D: run down ...