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【单选题】
以下（）不是电力系统运行的基本要求。A.
提高电力系统运行的经济性
B.
安全可靠的持续供电
C.
保证电能质量
D.
电力网各节点电压相等
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皮皮学刷刷变学霸
举一反三
【单选题】On the pole side of the trade wind belt，there is an area of high pressure with weak pressure gradients and light，variable winds．This area is called the ______．
A.
Prevailing westerlies
B.
Geostrophic winds
C.
Doldrums
D.
Horse latitudes
【判断题】It is avoidable for authoritative people to protect their rightness in some area of life. Many of the challenges they are faced with should be neglected in a way.()
A.
正确
B.
错误
【单选题】某疾病经济负担研究拟测量某地所有精神分裂症病人门诊治疗所形成的直接疾病经济负担，在计算精神分裂症病人总数时最好选用的指标是( )。
A.
患病率
B.
发病率
C.
就诊率
D.
住院率
【单选题】In some area, wind power has been successfully _____, creating an alternative method of producing energy.
A.
skipped
B.
tapped
C.
dragged
D.
choked
【单选题】The _______ wind in this area is from the south-west
A.
controlling
B.
prevailing
C.
persisting
D.
continuous
【单选题】In the Northern Hemisphere，an area of counterclockwise wind circulation surrounded by higher pressure is a ().
A.
Low
B.
High
C.
Warm front
D.
Cold front
【单选题】Some necessary equipment as well as food and clothes________sent to the disasterhit area since the powerful earthquake occurred. [ ]
A.
has been
B.
have been
C.
is being
D.
are being
【单选题】Some physicists have proposed that sunspots and solar wind have negligible effects on the earth's weather.
A.
undetermined
B.
insignificant
C.
unusual
D.
indisputable
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