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【简答题】
化简求值． （1）（2a+1） 2 ﹣（2a﹣1）（1+2a），其中a=﹣1． （2）（a﹣2） 2 +（2a﹣1）（a+4），其中a=﹣2．
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举一反三
【简答题】时间继电器的作用是按整定时间长短[填空(1)]通断电路。A. 延时
【简答题】时间继电器的作用是按整定时间长短（）通断电路。
【简答题】The author uses the expression “those babies” (Line 3, Para. 2) to refer to high heels ________. A) to show their fragile characteristics B) to indicate their feminine features C) to show women’s affe...
【单选题】The author uses the expression 'those babies' in the second paragraph to refer to high h
A.
3：The author uses the expression 'those babies' in the second paragraph to refer to high heels ______. A.to show their fragile characteristics
B.
to indicate their feminine features
C.
to show women's affection for them
D.
to emphasize their small size
【简答题】Juan walked 3 more miles than Rebecca. Rebecca walked 4 times as far as William. William walked 2 miles. Which of the following mathematical expressions is equivalent to the number of miles Juan walke...
【简答题】粘化作用的一般有利条件。
【单选题】She walked 7 miles today inn order to lose weight; I never imagined that she could walk far.
A.
as
B.
such
C.
that
D.
very
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