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【单选题】
NPN三极管放大导通必须满足这样的条件，即（）。A.
发射极加正向电压，集电极加反向电压
B.
发射极加反向电压，集电极加正向电压
C.
基极加反向电压，集电极加正向电压
D.
基极加正向电压，集电极加反向电压
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【简答题】集中注意力 范围 职业 低收入
【简答题】Scientists put forward that Northern Europe would have __________ if climate continues, while Britain would have warmer weather。
【多选题】《国务院关于加快发展旅游业的意见》的主要任务包括( )。
A.
深化旅游业改革开放
B.
优化旅游企业社会环境
C.
倡导文明健康的旅游方式
D.
加快旅游基础设施建设
E.
提高旅游服务水平
【单选题】___ research ___ the universe scientists have put a lot of information ___ computers. [ ]
A.
With; over; at
B.
On; at; to
C.
In; about; into
D.
For; with; through
【单选题】The committee ______ five famous scientists put forward a valuable plan at the end of conference.
A.
was made up
B.
was made from
C.
made from
D.
made up of
【单选题】According to scientists, if the energy in the atmosphere were put under our control, what would happen?
A.
We have an inexhaustible supply of energy from it.
B.
This could bring the world to an energy crisis.
C.
The sources of energy on earth would become unreliable.
D.
We find ourselves in difficult position with environmental pollution.
【多选题】《国务院关于加快发展旅游业的意见》(国发〔2009〕41号)对旅游业做出全新定位，指出把旅游业培育成( )。
A.
国民经济的支柱产业
B.
国民经济的战略性支柱产业
C.
人民群众更加满意的现代服务业
D.
人民群众更加满意的现代旅游业
E.
国民经济新的增长点
【单选题】The committee_______ five famous scientists put forward a valuable plan at the end of the conference. [ ]
A.
was made up of
B.
was made from
C.
made from
D.
made up of
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