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【单选题】
What a pity that he has made _____ friends since he joined the club.A.
only a few
B.
quite a few
C.
a few
D.
quite a little
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皮皮学刷刷变学霸
举一反三
【单选题】已知学生关系(学号，姓名，性别，课程号，成绩，所在系号)有下列函数依赖 Ⅰ．(学号，课程号)→课程号 Ⅱ．(学号，课程号)→成绩 Ⅲ．(学号，课程号)→所在系号 Ⅳ．(学号，课程号)→姓名，性别 Ⅵ．(学号，课程号)→学号 以上函数依赖属于非平凡函数依赖的是______。 A) 仅Ⅰ和Ⅴ B) 仅Ⅱ和Ⅴ C) 仅Ⅲ和Ⅳ D) 仅Ⅱ、Ⅲ和Ⅳ
A.
B.
C.
D.
【单选题】Which statement about the inert gas system is TRUE ________．
A.
Boiler soot blowers should never be used when the IG system is operating
B.
The boiler will produce the best quality of flue gas for the IG system when the boiler load is very light
C.
The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very light
D.
Flue gas with excessive oxygen content is de-oxygenated in the scrubber
【单选题】设有课程关系Course(课程号,课程名,学分,开设专业号,先修课程号)和专业关系Speciality(专业号,专业名),则课程关系Course的外键是
A.
课程号和开设专业号
B.
仅有开设专业号
C.
课程号和先修课程号
D.
开设专业号和先修课程号
【单选题】设有课程关系 Course (课程号,课程名,学分,专业号,先修课程号)和专业关系 Speciality (专业号,专业名),则课程关系 Course 的外键是( )。
A.
课程号
B.
专业号
C.
先修课程号
D.
专业号和先修课程号
【单选题】When the soot blowers are operating in the oil fuel boiler, the air/fuel ratio must _____ throughout the action, and blowers greased after use.
A.
be increased
B.
be decreased
C.
remain constant
D.
either be increased or remain constant
【简答题】A．课程号 B．课程名 C．课程号、教师名 D．课程号、课程名
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