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【单选题】
已知曲线 ,则 该曲线在(1,1)处的切线方程为(),法线方程为()
A.
y=3x-6,
B.
y=3x-2
C.
y=-3x+3
D.
y=-3x+1
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【单选题】The Electrolux Trilobite 2.0 robot vacuum cleaner ______.
A.
asks permission before moving from room to room.
B.
uses lasers to help it avoid objects.
C.
is programmable.
【单选题】What can be inferred from the passage?
A.
11 percent of boys in America smoke before their fourth grade.
B.
Nicotine is a part of cigarette.
C.
Children form. values in the fourth grade.
D.
Parents who cannot stop smoking should force their children to stay away from it.
【单选题】宽松牛仔外套适合搭配
A.
宽松牛仔裤
B.
紧身牛仔裤
【简答题】f___ n. an area where people have never lived before, that not much is known about, esp. in the western US before the 20th century
【判断题】买卖双方按D/P·T/R条件成交时,如日后汇票到期收不回货款,代收行应对卖方负责。 (    )
A.
正确
B.
错误
【判断题】买卖双方按D/P·T/R条件成交时,如日后汇票到期收不回货款,代收行应对卖方负责。( )
A.
正确
B.
错误
【单选题】等成本线是在总成本和生产要素价格既定的条件下,可以购买到的劳动和( )的不同数量组合的轨迹。
A.
资本
B.
土地
C.
技术
【简答题】是指:在既定的成本和生产要素价格条件下,生产者可以购买到的两种生产要素的各种不同数量组合的轨迹。
【简答题】Heat the pan with some oil before stir-f__ the carrots.
【单选题】宽松牛仔外套适合搭配
A.
紧身牛仔裤
B.
宽松牛仔裤
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