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【单选题】
电火花加工过程中,工作液必须具有的性能是( )A.
绝缘性能
B.
导电性能
C.
冷却性能
D.
润滑性能
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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
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