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【多选题】
符合条件( )时，用电单位宜设置自备电源。A.
需要设置自备电源作为一级负荷中特别重要负荷的应急电源
B.
设置自备电源较从电力系统取得第二电源经济合理或第二电源不能满足一级负荷要求的条件
C.
所在地区偏僻，远离电力系统，经与供电部门共同规划，设置自备电源作为主电源经济合理
D.
有常年稳定余热、压差、废气可供发电，技术可靠、经济合理
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举一反三
【单选题】Which of the following is NOT usually considered as a stem?
A.
Careless.
B.
Fair.
C.
Unselfishness.
D.
Responsibly.
【单选题】听力原文：W. Are you going to the fair next Saturday? M. What fair? W: The annual fair that Riverbell puts on the first Saturday in June to raise money for the Riverdale hospital The fair is being held on ...
A.
To organize activities for children.
B.
To sell local farm products.
C.
To bring tourists to the town.
D.
To make the money for the hospital.
【单选题】Anticyclones are usually characterized by ______．
A.
dry，fair weather
B.
high winds and cloudiness
C.
gustiness and continuous precipitation
D.
overcast skies
【单选题】When does the flower fair usually start?
A.
1 day before the Spring Festival
B.
3 days before the Spring Festival
C.
5 days before the Spring Festival
D.
7 days before the Spring Festival
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