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【单选题】
圆锥曲面的应该是( )。A.
不过锥顶
B.
同心圆
C.
和轴线平行
D.
过锥顶
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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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
【简答题】供电公司水电费
【单选题】Tom Williams arrives at Beijing Capital International Airport. He calls his friend___________.
A.
Dr. Nan
B.
Dr. An
C.
Dr. Wan
【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.
late
B.
early
C.
punctual
【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.
airport
B.
hotel
C.
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, fif-minute
B.
ten-minute
C.
fif-minute
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