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【简答题】
天然纤维中密度最小的是（）；耐光性最好的纤维是（）；耐磨性最好的纤维是（）.
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反馈参考答案：
举一反三
【单选题】Our ancestors have passed on to us the wisdom that to ensure the long-lasting prosperity of a country, we must show tolerance towards those who _________ along revolutionary paths.
A.
strike
B.
strike out
C.
strike on
D.
strike in
【单选题】方程x 2 +2x-1=0的根可看成函数y=x+2与函数 y= 1 x 的图象交点的横坐标，用此方法可推断方程x 3 +x-1=0的实数根x有几个？（ ）
A.
0
B.
1
C.
2
D.
3
【单选题】Before we focus on what must happen next, let us pause for a minute and ________ on that initial debate and the lessons to be learnt. [ ]
A.
strike
B.
reflect
C.
inspire
D.
imagine
【简答题】Our ancestors have passed on to us the wisdom that to ensure the long-lasting prosperity of a country, we must show ________ those who ________ along reolvutionary paths. Such people, with their new i...
【单选题】有如下几个说法： ①如果x 1 ，x 2 是方程ax 2 +bx+c=0的两个实根且x 1 ＜x 2 ，那么不等式ax 2 +bx+c＜0的解集为{x|x 1 ＜x＜x 2 }； ②当△=b 2 -4ac＜0时，二次不等式 ax 2 +bx+c＞0的解集为?； ③ x-a x-b ≤0 与不等式（x-a）（x-b）≤0的解集相同； ④ x 2 -2x x-1 ＜3 与x 2 -2x＜3（x-1）的...
A.
3
B.
2
C.
1
D.
0
【简答题】不求f(x)=(x-1)(x-2)(x-3)(x-4)的导数，说明方程f'(x)=0有几个实根．并指出它们所在的区间．
【简答题】Our ancestors have passed on to us the wisdom that to ensure the long-lasting prosperity of a country, we must show __________ those who __________along revolutionary paths. Such people, with their n...
【简答题】Our ancestors have passed on to us the wisdom that to ensure the long-lasting prosperity of a country, we must show ____those who ____along revolutionary paths. Such people, with their new ideas and p...
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