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【简答题】
共沸精馏中加入的新组分从精馏塔的()离开;萃取精馏中加入的新组分从精馏塔的()离开。
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反馈参考答案：
举一反三
【简答题】真空中一个半径为R的均匀带电球面带有电荷Q(Q>0)．今在球面上挖去非常小块的面积△S(连同电荷)，如图14-14所示，假设不影响其他处原来的电荷分布，则挖去△S后球心处电场强度的大小为__________，其方向为__________．
【简答题】Ways to Burn More Calories Run through water Running in water is one of the toughest activities you can perform because the wet stuff is about 12 to 15 times as resistant (具有阻力的) as air. Try your hard...
【单选题】Betty is careful as I, but I'm than you. [ ]
A.
as; much careful
B.
so; more careful
C.
as; much more careful
D.
so; very careful
【简答题】Nowhere else in the world_______ more beautiful sight than in Switzerland. [ A]you can find [ B]is found [ C] can you find [D] has been found
【单选题】The Internet appeals to shoppers in that
A.
it offers many more attractive products.
B.
you can pay for the products with a credit card.
C.
it is convenient to buy and compare products.
D.
all of the above.
【单选题】A small car is big enough for a family of three ______ you need more space for baggage.
A.
once
B.
in case
C.
if
D.
unless
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