refund是等于pay off还是pay back?

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• 解答几道英语单选题1.The man went into the room.____ rather strange.A.to look B.looking C.looked D.and looking为什么选B?不选D?2.Don't think of the exam,_____,it has passed quite a few days.A.In all B.Not ar all C.After all D.At all为什么选C?不选A?3.During the next ten years we both worked day and night to ___the money we had borrowed.A.pay off B.pay for C.pay to D.pay back第一题中间是“，”
• refund是等于pay off还是pay back?
• refund是等于pay off还是pay back?
• pay off 与pay back 的区别,哪个词组有表示偿还的意思,是pay off吗
• Jane waited all day for Jenny to ___2___ back the dollar she borrowed还钱是pay back还是return back
• pay off和pay back选题The teacher's efforts ___when one of his students was admitted to Beijing university last summer.用pay back还是pay off?给我理由.
• pay off 与pay back 的区别,哪个词组有表示偿还的意思,是pay off吗
• Jane waited all day for Jenny to ___2___ back the dollar she borrowed还钱是pay back还是return back
• 关于泰勒公式中的ξ,求高手!当展开点和展开阶数一定时,ξ是定值吗?例如：对f(x)在x0=0处二阶展开有： f（x）=f(0) + f'(0)x +f''(0)x^2/2 +f'''(ξ)x^3/6,ξ∈（a,b)那么对于x取不同值时,如取1和-1时（都满足展开条件）,有：f（1）=f(0) + f'(0) +f''(0)/2 +f'''(ξ1)/6f（-1）=f(0) - f'(0) +f''(0)/2 - f'''(ξ2)/6那么是不是ξ1=ξ2=ξ?还是说ξ1≠ξ2?
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