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【简答题】
GB 20665家用燃气快速热水器能效标准2级为（ ）%。
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【简答题】我国工农业生产和生活照明用电电压是____V,其最大值____V;周期T= ____s,频率f= ____Hz,角频率ω=____rad/s
【单选题】Tom Williams arrives at Beijing Capital International Airport. He calls his friend___________.
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Dr. Wan
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A.
late
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early
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punctual
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A.
airport
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hotel
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office
【单选题】Tom Williams arrives at Changdong Airport. He calls his friend, 1 Dr. Nan, Dr. An, Dr. Wan . His friend is surprised by his 2 late, early, punctual arrival. She is going to pick him up at the 3 airpo...
A.
five-minute, ten-minute, fifteen-minute
B.
ten-minute
C.
fifteen-minute
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