方程2x2-y2=1表示的二次曲面是 A.球面B.柱面C.旋转抛物面D.圆锥面
方程2x2-y2=1表示的二次曲面是
A.球面
B.柱面
C.旋转抛物面
D.圆锥面
方程2x2-y2=1表示的二次曲面是
A.球面
B.柱面
C.旋转抛物面
D.圆锥面
第1题
Look! The house's ________ fire. Let's get some help.
A.been caught
B.catching
C.caught
D.been catching
第2题
Why is Hank going to Lisa's house?
A.To attend a dance.
B.To get some food.
C.To see sick Lisa.
第3题
What do homeowners do before hiring a house-sitter?
A.Interview the house-sitter and look at his or her references.
B.Interview the house-sitter' s friends.
C.Look at the house-sitter' s transcripts.
D.Attend the house - sitter' s party to see whether he or she is a responsible person.
第4题
Before he arrived at the farmer's house, the writer expected to see Milly lying_______?
A.on the floor of a room
B.on the ground of a barn
C.in bed in a barn
D.in bed in a room
第5题
before he arrived at the farmer's house, the writer expected to see Milly lying ______.
A.on the floor of a room
B.on the ground of a barn
C.in bed in a barn
D.in bed in a room
第6题
before he arrived at the farmer’s house, the writer expected to see Milly lying ______.
A.on the floor of a room
B.on the ground of a barn
C.in bed in a barn
D.in bed in a room
第7题
A.They look at a house sitter's score report.
B.They interview a house sitter's friends.
C.They check a house sitter's references.
D.They attend a house sitter's party.
第8题
A.They look at a house sitter's score report.
B.They interview a house sitter's friends.
C.They check a house sitter's references.
D.They attend a house sitter's party.
第9题
He get a 10%______on every house he sells.
A.wage
B.commision
C.compensation
D.revenue
第10题
给下列的过去分词选择相应的原形。 | ||
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