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【单选题】
下列说法中,不正确的是( )。A.
当灯具达不到最小高度时，应采用24V以下电压。B电子镇流器的功率因数高于电感式镇流器。
B.
电子镇流器的功率因数高于电感式镇流器。
C.
事故照明不允许和其它照明共用同一线路。
D.
日光灯的电子镇流器可使日光灯获得高频交流电二
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【简答题】If you are planning to spend your holidays in Yellowstone National Park in summer, what should you take with you?
【简答题】Which of the following best describes Yellowstone's weather?
【单选题】The world's first national park, Yellowstone National Park , was established in Wyoming in 12 to protect an area of ______ natural beauty.
A.
incredulous
B.
incredible
C.
edible
D.
believable
【单选题】Visitors to Yellowstone Park ______ consider their impact on the natural environment, leaving behind litter and other damage.
A.
nearly
B.
seldom
C.
ever
D.
yet
【单选题】Yellowstone National Park is (one of) the (older parks) in the United States. It was (established) by Congress (in) 1872.
A.
one of
B.
older parks
C.
established
D.
in
【单选题】Why does the professor think Ann would be interested in going to Yellowstone?
A.
She is from Yellowstone.
B.
She needs the money.
C.
She has been studying animal diseases.
D.
Her thesis adviser is heading the project.
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