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问题 单项选择题

港口重大危险源安全评估满（）的应当对港口重大危险源重新进行辨识分级。

A.一年

B.二年

B.三年

C四年

答案

参考答案：B

阅读理解

阅读理解。

                                                                SUNNY SCHOOL 
     We are a bilingual (双语) school for children of 6-15. We want a cook, a library assistant, a sports coach
and a language teacher.
Job Age Language Skill Other terms (其它条件)
cook 25~40 Chinese can cook Chinese and
Western food 		healthy
library
assistant		20~35Chinese,
English 		know about all kinds of
books 		careful
sports
coach		20~40 Chinese,
English 		major in (主修) P.E. healthy,
strong
teacher30~45 Chinese,
English		major in English--
1．Who CAN'T go to Sunny School?
[ ]
A. An eighteen-year-old kid.
B. An eleven-year-old boy.
C. A fifteen-year-old girl.
D. A fourteen-year-old child.
2．Who is NOT wanted by Sunny School?
[ ]
A. A sports coach.
B. An English teacher.
C. A library assistant.
D. A math teacher.
3．We know ______ may not speak English in Sunny School.
[ ]
A. the sports coach
B. the cook
C. the library assistant
D. the language teacher
4．The coach must major in ______.
[ ]
A. Chinese
B. English
C. food
D. P.E.
5．The Sunny School wants a teacher ______.
[    ]
A. aged between 25 and 40
B. who can cook Western food
C. who is careful and strong
D. who can speak English and Chinese
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不定项选择

某车间变电所采用需要系数法计算负荷时，有下列用电设备组：起重机负荷，其中负载持续率为e＝25%的电动机8台，额定容量共计为140kW，负载持续率为e＝40%的电动机12台，额定容量共计为320kW，需要系数KX＝0.2，cosψ＝0.5大批生产金属冷加工机床，额定容量共计1400kW，需要系数KX＝0.18，cosψ＝0.5；联锁的连续运输机械，额定容量共计640kW，需要系数KX＝0.65，cosψ＝0.75；生产用通风机，额定容量共计 240kW，需要系数KX＝0.8，cosψ＝0.5照明负荷为高强气体放电灯(带无功功率补偿装置)，包括镇流器的功率损耗在内的额定容量为84kW，需要系数为KX＝0.95，cosψ＝0.9。

计算后的自然功率因数为()。

A．0.74

B．0.71

C．0.67

D．0.64
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